I have permission from Candie Apple to include her contributions, and thought I had permission from Lindal and Oryx. However, I just learned a few minutes ago that the permission had not been checked. I hope Lindal and Oryx are okay with me using some of their defintions. If they are not, I will be happy to rewrite their contributions.
So--presented for your review and elucidation:
The Big Damn SL Glossary
AO - (n) Animation Overrider. A scripted device that contains replacements for the default walking, sitting, flying, and standing animations of your avatar. Some also have other functions. An AO can be customized by loading your own favorite animations. AOs should be turned off before engaging in poseball or other animations, since the animations can conflict with one another.
Adfarm - (n) clusters of rotating towers of advertisements, considered by many to be an eyesore.
Admit List - (n) the list of those allowed in an area that otherwise excludes everyone by use of a script.
AFK (Away From Keyboard) - (adj) describes a player who has left his computer to take care of some task in Real Life (RL). If they've taken the time to set themselves as "Away" you will see the word (Away) next to their name.
Alt - (n) Alternate Account; many Second Life residents have more than one account for a variety of reasons, including: keeping one’s business life separate from social life, role-playing, avoiding harassment, keeping track of L$ (bank alts), and being able to work uninterrupted by Instant Messages.
AR (Abuse Report) - (n or v) formal report to Linden Lab of a violation of community standards or SL terms of service. Also used as a verb. ("I AR'd the guy."

Asset Server - (n) The database that tracks all Second Life objects in-world and in inventory. Overloaded asset servers can cause search, inventory, rez, teleport, and Friends list failures.
Attach - (v) usually, to take an item from inventory and cause it to be fixed to a certain part of your avatar's body.
Attachment - (n) an object (clothing, weapons, jewelry, shoes, etc) that can be attached to an avatar at a specific location. Usually location is set by the creator of the object.
Avatar (AV) - (n) the animated being that represents you on the screen.
Baked - (adj) freshly donned clothing will often look clear and sharply defined and then, a short time later, become fuzzy and clear again. At this point, it can be assumed that everyone in the area can now see your clothing clearly. The textures are then "baked" in.
Banlink - (n) Distributed ban sharing system developed by Travis Lambert and Mera Pixel that allows subscribing locations to share banlists.
Banlist - (n) the list of those banned from an area, by use of a script, or by Landban that otherwise allows visitors.
BIAB (Business In A Box) - (n) often sold to newcomers as an easy way to make money, BIAB packages generally contain merchandise that is poor quality, out of date, stolen from the original creators, or available elsewhere for free.
Bling (n) – Jewelry and attachments scripted to emit particle based shimmering “bling” effects.
Borked - (v or adj) messed up, broken. "The teleport function is borked again"
Bot - (n) an alt account run by a computer. (see Landbot)
Boxhead - (v) the act of wearing an object, usually a package prim, on your head or other location. Package prims are meant to be rezzed on the ground, but newcomers often mistake them for the object(s) they contain, and try to wear them instead. Originally the default attachment point for objects was the head. Later updates of the Second Life client changed that to the right hand.
BRB - (acronym) Be Right Back, shorthand meant to imply that the speaker is away from the keyboard for a moment, but will return very shortly.
BTW - (acronym) By the Way
Busy Mode - (n) A mode where your Avatar does not hear nearby chat, where IMs receive the “busy mode” response, and all inventory and teleport offers are automatically declined.
Calling Card - (n) an item with a particular player's name that goes into the Calling Card section of your inventory. Calling cards allow you to monitor whether the player is online and gives you easy access to the player's profile. You can drop items on a player's calling card so that the item is delivered to that player.
Camping - (v) the practice of earning small amounts of $L by sitting on a chair or engaging in menial activities. Merchants use campers to make their store look more popular on the grid map. Experienced SL Residents usually don't waste their time camping.
Clear Cache - (v) the act of setting the SL client to clear its local storage of SL-related data and textures the next time it is started. Often problems with slow-loading textures can be fixed by clearing your cache. Clearing your cache can also make missing inventory items reappear.
Client - (n) Second Life consists of two software parts. The client, or viewer, resides on the user's computer. The server resides in a remote location.
Client Menu - (n) A normally hidden menu in the Second Life client that allows access to extra commands. The Client menu can be toggled on/off by typing CTRL-ALT-D.
Community Standards - (n) the agreement all players subscribe to which determines the limits of appropriate behavior while playing the game.
Concierge Service - (n) a higher level of customer service and assistance available only to island owners and mainland land owners paying more than 125US$ per month in tier. This service level includes Lindens dedicated to Concierge support duties and toll-free Concierge level-only phone help.
Cyber - (v) Short for cyber-sex. The practice of engaging in sexual roleplay using chat and Second Life avatars and animations.
Damage - (n) in certain regions, it is possible for an avatar to experience "injury" resulting in a loss of points that may result in death. At that point, the avatar is teleported to it's Home and the points are restored. Damage-enabled areas can be set for one person's property or for an entire region. If you are in a damage-enabled zone, you will see a red heart at the bottom of your screen with a number showing points from 1 to 100.
Day - (n) day time is about 2 hours long. Night is about 1 hour long.
Death - (n) when your avatar is in an area that allows damage to occur, a red heart will appear at the bottom of the screen. Next to it is a number that is initially set to 100 percent. If the amount of damage your avatar suffers drops to zero, the avatar dies. It is then teleported to Home and the points are set back to 100%.
Detach - (v) usually, to remove an item that has been attached to a specific part of the avatar's body and return it to inventory.
Developers Incentives - (n) a now discontinued Second Life feature that paid US$ awards to the owners of the locations with extremely high Traffic.
Draw Distance - (n) the radius centered on your avatar that your client renders the Second Life world. If you are on a slower computer, you may be able to speed up your Second Life experience by reducing your Draw Distance.
Drop - (v) (1) to remove an attached item from your avatar and drop it on the ground, instead of returning it to your inventory. (2) to place an item on an avatar or a calling card.
Dwell - (n) a now discontinued Second Life feature that paid land owners in L$ according to their land's Traffic. Sometimes mistakenly used as a synonym for Traffic.
Eject (also, Boot or Kick) - (v) to expel from a property.
Estate - (n) one or more privately owned sims.
FIC (Forum In-Crowd or Feted Inner Core) - (n) Originally a term for SL residents who received unusual access or special treatment from Linden Lab, it has now become more general to refer to any influential SL resident (“She so FIC”). FIC originated at a time when the Forums were more widely used and were frequented by Lindens.
Flexi, Flexible, Flexified - (adj) describes an object made up of a prim or collection of prims, e.g. "flexi skirt" that utilize many of the features on the "Features" tab on the object edit screen. These features force the object to move with the Second Life wind vector pressures and/or movement of the avatar to which the object is attached.
Full Perms (Full Permissions) - (adj) an object set so it can be freely copied, modified, and transferred.
Furry - (n) Second Life resident using anthropomorphic animal avatars.
Gesture - (n) a command that animates your avatar to perform actions such as smiling, dancing, bowing, waving, etc.
Gor - (n) series of BDSM-oriented Science Fantasy novels by John Norman that have given rise to dozens of role-playing sims throughout Second Life.
Gorean - (n) Second Life resident who identifies with the culture of one or more of the various Gor sims.
Grid - (n) (1) the network of servers that make up the Second Life world (Example: “The Grid is down so the Lindens can fix it.”) (2) a series of intersecting lines that give a regular reference for building.
Grid Address (also Grid Coordinates) - (n) the name of a region combined with three numbers between 0 and 255 for the X & Y (north-south & east-west) coordinates, and from 0 to 760 for the Z (up-down) coordinate. Example: Ahern (200, 155, 50).
Griefer - (n) A person whose primary purpose is to harass others and destroy their enjoyment of Second Life. Griefers should be Abuse Reported.
Group - (n) an in-world player-created association. Belonging to a group also includes the ability for several avatars to work on one project.
Group Title - (n) the labels designated for officers and members of a group. Group Titles appear over an avatar's name when that group is active. You can change that title by changing your Active Group. To change that, right click on your Avatar and select “Groups” from the pie-shaped menu. In the Groups window that appears, scroll down to the group you want, and then click the “Activate” button.
Home - (n) the location that you teleport to when you choose the menu item "Teleport Home" or when you "die." You can set this location with a menu command. Home may be set to land that you own, land that a group you are a member of owns, or Linden Land that is set to allow home to be set (such as Welcome Areas or InfoHubs).
HUD - (n) Head Up Display. A control panel for an AO or other device that appears on screen.
Infohub - (n) a Linden Lab-owned information and social area. Infohubs are located at some of the former Telehub locations and are built and managed by residents or resident groups. Some new players first spawn at Infohubs after leaving Orientation Island or Help Island.
IM (Instant Message) - (n) the chat window that allows two players to speak privately.
IM Coma/IM Trance - (n) a state in which one person, usually a Liaison, is not moving, chatting or responding to chat because he or she is being bombarded with IMs.
Inventory - (n) the window that contains everything you possess that isn't manifest in the world.
In-World - (adj) the state of being connected to the Second Life servers and present in the Second Life world. Also: online.
IRL - (acronym) In Real Life
Lag - (n) the condition of running slowly. This can be caused by the server, your internet connection, or the objects, scripts and activities of the players around you.
Landban - (v) to ban from a parcel using the SL client ban tools available to land owners authorized members of groups owning land.
Landbot - (n) An alt account run by a program designed to quickly purchase land sold below a set price. Land that is incorrectly priced too low, or is set to sell for a nominal sum to "anyone", will almost certainly be snapped up by a landbot.
Landmark (LM) - (n) landmarks are shortcuts to places in Second Life. If you double click on a Landmark, a window pops up that allows you to see that location on a map or to teleport directly there. You can create a landmark anywhere using a menu command, and can then be given to other players. Landmarks you create or save default to being stored in the Landmarks folder of your Inventory.
Linden - (n) an employee of Linden Labs. Linden employees are referred to as "Lindens" because all of them have that last name when in the game. (2) (n) Linden dollar, the currency of Second Life.
Linden Dollar (L$) - (n) the unit of currency for all monetary transactions in Second Life. Lindens are a microcurrency and can be traded for real world currencies on the Lindex and on other third party exchanges.
Linden Labs (LL) - (n) the creators of Second Life.
Link - (v) when building, multiple prims may be linked together with a menu command. When linked, they can be moved as one unit.
Live Help - (n) A now discontinued feature of Second Life. The "Live Help" command on the Help menu allowed you to access in-world help chat with Lindens and Live Help resident volunteers. Live Help has been superseded by the support portal on the SL website.
Lock - (v) to set the lock flag for an item, making it un-modifiable.
Log - (1) (n) a transcript of chat, or of computer activities. (2) (v) to log out, to go offline, to stop playing Second Life.
LOL (acronym) - Laughing Out Loud. Shorthand meant to convey that the writer is actually sitting at the computer laughing at something someone has said or done. "That's some silly cheese hat you have there! LOL!"
Lot (also Parcel) - (n) a contiguous section of land owned by one person or group. Size if measure in meters squared (m2).
LSL - (acronym) Linden Scripting Language. Programming language used inside SL.
Lucky Chair - (n) Scripted chairs that give out prizes when you sit on one that is displaying the first letter of your first name.
m2 - (adj) abbreviation for square meters used in talking about Second Life land.
Mainland - (n) the continents managed by Linden Lab. Land on the mainland is initially auctioned off by Linden Lab in one sim blocks.
Map - (n) the window in the Second Life application that displays the map. It can be used to find locations, individuals, and specific coordinates. (v) to select an avatar's name in the map window so that the avatar can be located, or followed, on the map. Mapping will only work on Avatars on your Friends list that have set their client to allow you to map them.
Map Window - (n) the window in the Second Life application that displays the map. It can be used to mark locations, individuals, and specific coordinates.
Mature - describes an area that allows behavior forbidden in the PG areas. This may include profanity, nudity and sexual content and activities - to the extent that such behavior is legal.
Mentor - (n) a resident volunteer working with Linden Lab of Second Life who teaches and guides other citizens.
Mouseview - (n) typing the letter "m" will change the main window to a first person view that will change according to mouse motions. This is the usual view for weapons fire. It is also useful for flying in some circumstances. Hit the Escape key to exit Mouseview.
Mute - (v) choosing the option that prevents you from seeing the chat from another player.
Neko - (n) mostly human avatars with some cat like characteristics, such as ears, whiskers and/or tails. Has its origins in Anime.
Night - (n) day time is about 2 hours long. Night is about 1 hour long.
Notecard - (n) an inventory item containing text and/or embedded textures, snapshots, objects, or other notecards. Items embedded in notecards must have copy/modify/transfer permissions.
Offline - (adj) the state of being disconnected from the Second Life servers and absent from the Second Life world.
OMG - (acronym) shorthand for "Oh My God!"
Online - (adj) the state of being connected to the Second Life servers and present in the Second Life world. Also: in-world.
OOC - (acronym) role-playing shorthand for "Out of character." Used in role-playing sims to let the listener know that the avatar is speaking as him or herself--not as the character he ore she is playing.
Outfit - (n) a group of clothing items in a single folder in Inventory that can be dropped on the avatar to effect a fast change of appearance.
Permissions (Perms) - (adj) Second Life's built-in "intellectual property" system. Creators can choose whether subsequent owners of their creations can Copy, Modify, and/or Transfer that item. Creators who want to preserve their intellectual property rights usually limit one or more of these attributes.
PG - (adj) describes an area that does not allow profanity, obvious sexuality, or intentional nudity.
Physical - (adj) objects that have their "physics" flag set are subject to simulated Newtonian effects. These objects will bounce, collide, and be affected by gravity,
Poseball - (n) balls that contain animations that can make your avatar dance, as well as do many other things. Used by clicking on the ball and selecting "Sit Here" or "Animate" from the menu. Usually colored blue (for men) and pink (for women).
Posing Stand - (n) standing on this item locks your avatar in position. Used primarily for editing the position of attached items like hair and jewelry while being worn.
Prim - (n) Basic shapes such as cylinders, cubes, pyramids, or spheres, used to build objects.
Prim - (n) Short for "primitive" the basic shapes that almost all objects in Second Life are made from. A single object can be made of many linked primitives. Prims are created, shaped, and textured via the Edit window. The basic Prim types are: Box, Cylinder, Sphere, Ring, Tube, and Torus.
Prim Hair (or eyelashes, or fingernails.) – (n) Hair made from twisted and textured prims. You can generate a basic hairstyle with the avatar appearance sliders, but a wig made of prims looks much more realistic.
Prim Limit - (n) The number of prims that can be placed on a given parcel of land.
Prim Taxes - (n) A now discontinued feature of Second Life. Before Second Life 1.2, the amount of prims residents could have in world was limited by "taxes" on each prim deducted from the Avatar's account when prims were rezzed.
Private Island - (n) a sim owned by someone other than LL.
Profile - (n) the window that contains personal information about a avatar. The Profile window can contain a picture of the avatar, a list of the groups they belong to, a description. Additional Profile tabs include space for a website, Picks, Classifieds, a First Life section, and a Notes section.
Rating - (n) a now discontinued feature of Second Life. Ratings once were the positive or negative vote a player could give to another player for their avatar's appearance, the player's building ability and how well the players relates to others.
Ratings Bonus - (n) a now discontinued feature of Second Life that paid stipend bonuses to people with high Ratings.
Re hi - (idiom) shorthand for "Hello, again" Usually spoken to someone who is seen again within a short time of a previous conversation. "Rehi, Kathy. How was supper?"
Rebake - (v) To force one's clothing and body textures to re-rez in order to correct blurred or "Missing Image" problems with one's avatar. The rebake command is accessible via the Character sub-menu of the Client menu.
Rez - (v) (1) To create an object, or bring an object out of your inventory into the world. (2) (v) Rez also refers to objects and avatars loading when you enter a new area, i.e.,“I teleported to the island, but it took forever for the buildings to rez.” (Derives from "de-rez" a fictional hacker term in the movie "Tron".)
RL (Real Life) - (n) (1) an imaginary, dream-like world frequently described by avatars shortly after waking up in-world. (2) the constant interruptions that interfere with your ability to stay in-world 24 hours a day.
Ruth - (n) (1) The default avatar: usually female, short, with red swept back hair. (v) (2)
Being “ruthed” is Second Life slang for appearing in the shape of the female default SL Avatar (normally due to server lag). To de-ruth yourself, try going into Appearance mode, making a very minor change, and then saving that change. If that fails you can try logging out and then logging back in again.
Safe - (adj) describes areas which are set initially to not allow avatars to take damage. Individual landholders can enable damage on their own land, however.
Script - (n) a program that is written Second Life's Linden Scripting Language (LSL). A script can be placed into an object to cause it to have an effect on those people or things around it.
Scripted Item - (n) an object that contains a program that allows it to behave in various ways. Scripts and animations are the "life" of Second Life.
Server - (n) the processor that runs the programming necessary for one region of the world. Multiple sims are run on different processors in the same computer.
Sexgen - (n) Trademarked name for an extremely popular brand of scripted erotic attachments from Eros Inc. Third-party scripted erotic attachments are often promoted as “Sexgen Compatible”.
Shout - (v) by clicking the Shout button, a line of chat can be audible out to a 100 meter radius.
Sim (simulator or region) - (n) (1) A 65,556 square meter (256m x 256m) region of land hosted on one processor, a single "grid square" on the SL map. Sims may be privately owned, or managed by LL. (2) (n) the server that supports a particular region.
Sim Boundary - (n) the border between two sims. Crossing sim boundaries can cause problems, as your avatar and its settings are transferred from one server to another.
16m2 - (adj) The smallest size of land parcel that can be created in Second Life. Often used for single prim servers or eyesore ads.
Skin - (n) A texture image that replaces the default skin of your avatar. Cannot (usually) be adjusted by the appearance sliders, but looks much better than the default skin.
Skybox - (n) any building located up in the sky, instead of on the ground.
Slingo - (n) a game resembling bingo but invented for Second Life. Not to be confused with "SLingo."
SLURL - (n) A type of weblink that launches the Second Life client and teleports you to the location indicated via the slurl.com website.
Spam - (n) an unsolicited instant message, notecard, texture, group invite, animate request, or object sent to multiple people. This can be sent by another player, or by an object containing a script.
Stipend - (n) the money given to a player by Linden Labs on a weekly basis. Premium accounts receive Stipends (300L$/week), though some older accounts have been grandfathered in under previous stipend programs.
Telehubs - (n) A now discontinued feature of Second Life. Before SL version 1.7, point-to-point teleporting was not enabled. Teleports all landed at the nearest Telehub to the destination point. From there, you had to fly to your destination. Most Telehubs were eliminated, but some were converted into Infohubs.
Teleport (TP) - (v) to transport oneself instantly to another location. In Second Life, you can teleport by clicking on a landmark, using the map window, responding to a teleport request, or by selecting "teleport home" from the World menu.
Texture - (n) a graphic uploaded to Second Life for application to the surface of an object or to clothing.
Terraforming - (v) the act of changing the shape and elevation of land. Most Mainland sims are limited to +/- 4 meters terraformability. Land on Private Estates can be terraformed up to +/- 100 meters.
Tier - (n) the monthly land “tax” you pay to either Linden Lab (on the mainland) or to a private island owner to own land. The more land you own, the higher your monthly Tier fees--but the less you pay per square meter (m2). Premium members get 512 m2 of free mainland tier.
Tier Up - (v) to raise the level of tier you pay monthly to Linden Lab. Tiering up allows you to own more land and/or make a higher tier contribution to a Group.
Tooltip - (n) the information that appears when a mouse pointer is moved over an item or avatar. Slide the mouse arrow (without pressing any mouse buttons) over the item and the tooltip will appear, telling you the name or cost of an item, or the name of an avatar.
Traffic - (n) a Linden Lab generated measure of how many avatars frequent a parcel of land and how long they stay. Higher traffic results in a higher placement in the "Places" search. (see Camping)
TY - (acronym) shorthand for "Thank You!"
Voting Machine - (n) a machine that is usually marked "Vote" that allows a visitor to register approval for the owner's building. Voting machines were once tied into the now-discontinued SL "Dwell" system where money was awarded to the owner of the property according to how many votes occurred the previous day.
Welcome Area (WA) - (n) a Linden Lab-owned and designed information and social area. The two largest Welcome Areas (Ahern and South) are located at the intersection of four sims to support a large number of people, and are surrounded by Linden-owned greenspace. Some new players first spawn at one of the Welcome Areas after leaving Orientation Island or Help Island.
WB - (acronym) shorthand for "Welcome Back!"
Whisper - (n) speech (usually by objects containing scripts) that is audible only within a 10 meter radius from the object.
Windlight - (n) Sky and atmospheric and lighting effects for Second Life, developed by Windward Mark Interactive, which was purchased by Linden Lab for their technology.
X-Axis - (n) The East-West axis of the in-world coordinate system.
Y-Axis - (n) The North-South axis of the in-world coordinate system.
Yiff - (v) Slang term for furry sex.
Z-Axis - (n) The up-down axis of the in-world coordinate system.