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1.
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 :("
door Sasori 18 april 2004
 
2.
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?
door Wot happin 26 oktober 2003
 
3.
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"
door Lord Nym 8 september 2003