Sig/signature: Each member has the ability to make a custom signature which will appear below every single one of their posts. "Sigs" as they are commonly referred to generally contain links leading to a thread where a member is trying to sell or trade an item. It is a simple way of offering trades.
BST: Buy, Sell, Trade: You probably know if you're in this section but it means Buy, Sell, or Trade
56k Beware: Used to tell potential buyers that the thread contains a lot of pictures. If you're on dial-up it may slow your speed way down
F/S/T: For Sale Trade: very straight forward
WTB: Want to Buy: A member is looking to buy a particular gun or item. These threads are almost always located in the WTB section
WTT: Want to Trade: A member is looking to trade one item for another item. These threads are almost always located in the Trade Shack
WTS: Want to Sell: People rarely use this term but it means someone is looking to sell an item. These items are located in all of the selling sections
PP: Paypal, easy way to send money when purchasing an item
OP: Original post/poster (depends on context) refers to the original post for the ad or the seller
Shipped: This word generally follows a cash offer stating the price being offered includes shipping costs
Pending: Once the seller or trader and the buyer has come to an agreement on price or items being traded the seller/trader will normally write
PENDING on their thread to signify the item is basically sold
PC: Players club: This is a feature that members pay $30 to gain entrance to, you get a blue title in your members section (Like me) and are given extra bst protections such as being able to ship second when trading.
Bump: Bring up my post: Used to litterally "bump" a thread to the top of the forum where more people will see it. The rules state that members may only do this once every 12 hours
ttt: To The Top: Same as bump
BNIB/NIB: Brand new in box/New in box: The item is still in the original packaging unopened
LNIB: Like new in box: Gun shows very little signs of wear
Straight: Straight trade: Neither party adds any money to a deal
PM'ing: Private messaging: Used to exchange personal information pertaining to a deal
OBO: Or best offer: pretty straight forward, whoever gives the best reasonable offer gets the item
LMK: Let me know: When making an offer some people will say lmk to signify they want a response from the seller
Bold: When a word is bolded like this, the seller is likely pointing out an important piece of info such as problems with the item or trades he/she is interested
GLS: Good luck selling: When an offer is declined the polite thing is to thank the seller for considering or say good luck selling
NTY: No thank you. Pretty much self explanatory, it's just someone declining an offer.
I probably missed some, let me know if anything should be added or if you have any clarifying questions
Edited by andrewthewookie, 05 June 2012 - 08:54 PM.