Slang

l33t syndrome: A common disease that infects children, usually male, between the ages of 13 and 17.
Symptoms include a propensity to use numbers and misspellings (as well as mispunctuation)
in place of proper 'net English, a terrible need to prove oneself, and many other annoying habits that only script kiddies and l33t h4x0R boys (and girls) have.
Example: My learned colleague would have presented a compelling argument,
had he remembered to keep his l33t syndrome symptoms down.
As it is, he sounds like a prat more than an intellectual.

n00b: A newcomer or novice--newbie.
Example: That n00b didn't know what he was doing; all the experienced players laughed at him.

yourmom: Fast and easy retaliation to virtually any insult hurled at you.
Example: Insult: Elvin, you don't know anything from Shinola. Response: Yeah? Yourmom.

pwnage: Ownage. The word own is often used in the gaming world. When people type quickly, they make more typos. Pwnage is one of them, because the O is right next to the P. Eventually, the habit turned into an actual statement used.
Definition: superiority; the aquisition of more skill/ability than other things/people.
Pronunciation: POE-nidge
Example: This is total pwnage. I pwned you.

bosh: Awesome or great.
Example: That dress looks bosh.

Karen:(Dane Cook) a person in a group of people that no one can stand. you keep them there to hate their guts

roffle: Rolling on the floor laughing, but not rofl. Written as you say it, probably because typing it that often means you almost say it out loud. Most commonly used to confuse people not 'in the know'.
Example: Person A: I was thinking about becoming a priest, but I don't like small boys. Person B: Roffle!

rice rocket: beefed up japanese import car that's real popular now
Example: The Honda is such a rice rocket.

sick: possessing exceptional talent. bad-ass.
Example: You need to check out this band, they have an awesome bass player.

Fart: noun - 1. an invisible and often malevolent entity that can only originate from the human rectum; the common fart generally lies dormant until the host expels it.
verb - 1. to forcefully expel or passively allow a unit of gaseous particles from one's rectum.
aka, "blasting the butt trumpet"
His metal chair only served to amplify the mighty fart he emitted.