A "expert" (no one really knows just what the expertise relates to) suffering from a self-induced delusional paranoia who thinks that any internet forum or BBS that is not open to the public is filled with hackers and evil, baby-eating Satanists that are plotting to take over the world. That is, after they kill him first, of course.
"Don't mind him, he's juat an AO."
"Kind of reminds you of an AO, doesn't it?"
The shortdown of a phrase "What do you think".
Wachoothink, will Armageddon happen or not?
In chats, used as an abbreviation to "good"
<Dude> I found a hundred bucks today
<pwn0r> gd gd
When something very l33t is like "BOOOOM!"
Oh NOES AN EKSPLOSION!
MultiMedia Fusion - a very powerful game and application creation tool. This is a very common word between "clickers", together with TGF and KnP.
The way some internet users spell the word "cool". May be also concidered a part of 1337 speech.
The music is kewl.