Internet slang is slang that Internet users have created and used, often in instant messaging and forum discussions. They are frequently acronyms, designed to save keystrokes in an attempt to speed up communication.
List of Internet slang
ROTFL: Rolling On The Floor Laughing
LOL: Laugh Out Loud
ATM: At The Moment
ASL: A request for Age, Sex, and Location.
BRB: Abbreviation for Be Right Back
IM: Abbreviation for Instant Messaging.
Ur: your, you're, you are
4: for, four
BBL: be back later
BBIAB: be back in a bit
GG: gotta go, got to go, good game
Pwn: Defeat someone, misspelling of "own"
IANAL: Sometimes IANALB, "I am not a lawyer (but)" said right before (usually) poor legal advice.
IIRC: If I remember correctly
WYSIWYG: What you see is what you get, also a word processing editor type.
L33T Stands for Elite
Noob Person is unskilled at whatever task they are trying to preform due to lack of experience and refuse to acknowledge their difficulty with the task.
Newb Person is unskilled at whatever task they are trying to preform due to lack of experience
GDR Grinning, Ducking and Running. Usually typed right after making a groan-inducing joke.
D00d L33tsp43k spelling of "dude".