I've Seen Numerous Post Asking So Heres A Big One Explaining.
*I will be updating when i find more thanks ;)*

Troll
A troll is a person who digs around commenting in such a way that he/she will know cause a fight.
I.E "That tutorial was completly horrible gtfo newb".

Leech(er)
Someone who does nothing to help/contribute anyone, But ask for help,money, and/or invites to a modded lobby.
I.E "A one hit wonder asking, Please invite to 15th CT Lobby pl0x!"

Scammer
This term refers to ANYONE who takes money without giving the buyer/giver of money the exact product as you described when setting the deal.
I.E "Selling Un-Banned KeyVault, Then You Send Him A Banned One."

Newb
This term refers to someone who is new at what he is doing. You should not get offended by people calling you a newb. As it just means you are new to TTG for example.
I.E "GTFO newb!!"

1337
This is a term/number that people use to classify themselves usually.
It means that they are special, smarter, or just overall better
I.E "Im soo 1337 at hacking no one can touch me"

GraveDigging
Grave digging is a term used to refer to a person who post on a very old thread. That thread was "dead" before you posted on it an bumped it. Which is where they get grave digging from.
I.E "A introduce yourself thread from 3 days ago you find on bottom of forums an you post on it, You are grave digging".

pl0x
This is a term that refers to please. Its just a "1337" speak. (see above definition of 1337)
I.E "Can i have 48 hour trial pl0x". Also dont be a leecher!(above definition)

GTFO
An internet acronym short for "get the fu~~ out".
It is used to express indignation, usually towards stupidity, incompetence, or both.
It can be used in response to something that is unwelcome.
I.E "May i have 48 hour , No GTFO you leecher"
(Thanks deano for this one)

FacePalm
This term refers to when someone says a just outright stupid statement. An you feel like you could just hit your face into your palm it was so bad.
I.E "Can i be admin ? Facepalm!

IP
This term refers to internet protocol. Its basically your identity on the internet. Theres many ways to change or hide it, with very little research.
I.E "How to change IP easily"

SB
Just another term easier to type for Shoutbox.
I.E "Yo go check out the SB in the forums tab."

FR
A acronym for Friend Request.
I.E "Yo accept my FR i just sent you."

FL
This acronym stands for Friend List.
I.E "Your friend list is full of staff!"

BK
A acronym for bad kid. This is used for people trying to insult the "newbs"
I.E "You die in Team Death, a team mate says your a BK"

STFU
A acronym for Shut The Fu~~ up.
Used if you really dislike that person.
I.E "Someone trolling on your post. You say STFU"