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1.
The combination of the words 'what' and 'happened'.
Could also be used as "What's happening?"
What + happened = Wappen
by Photik June 01, 2006
 
2.
Conjunction of 'what' and 'happens.'
Wappens if...
by mattheeternalsexgod February 02, 2010
 
3.
wats happenin
wappen star
by Nathan September 22, 2003
 
4.
When a semi retarded kid finds his 7 year old friend on the floor crying and wants to know what went on. A fast upbeat What Happened.
Matt: *cries*
Mike: WAPPEN!?
by Love Gun79 November 02, 2005