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1.
What you say when the bomb has been set up to you by someone. Usually follwed by "We get signal" and a turning on of the main screen.
"What happen"
"Somebody set us up the bomb"
"We get signal"
Beküldő: Lord Nym 2003. szeptember 8.
 
2.
An interrogative as to the events that have come to play, be it in the distant past, the recent past, or the present. This phrase may or may not use a question mark, but is an interrogative, regardless.

This phrase, popular among geeks, alludes to the poorly-translated Sega game Zero Wing; however, it is not always used for its pop culture value alone.
person: "Oh shit."
person2: "what happen"
person: "My term paper got deleted from my computer!"
person2: "Seriously? Oh, shit! Are you sure there isn't a back up somewhere?"
person: "Nope, not one back-up."
person2: "All your docs are belong to trash :("
Beküldő: Sasori 2004. április 18.
 
3.
Literally: "what happened?" Comes from some Japanese video game in a poor English translation. See also: all your base are belong to us, someone set up us the bomb, make your time, et al.
What happen?
Beküldő: Wot happin 2003. október 26.