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1.
Phrase used to ask a person to repeat their statement or question.
"Hi, I'd like a turkey sandwich with mustard and tomato."

"Wha happen?"

"Uh, nothing happened, except for the fact that I'd like to order a sandwhich."

Words related to wha happen?

excuse me pardon me wa happen wha' happen what's that
 
2.
how a puertorican says "what happened?". This is usually used at the beginning of a conversation.
joselito: whahappen?
papo: nothin' man. some nigga got shot.
joselito: oh dip!
by g-ring September 24, 2007