Top definition
Internet slang for "What the fuck's up"(1). Often used to bypass moderate filters.

May have "suffixes"(2) added to the end to produce an extended form of the word.
1. "Waddafuxup man?"

2. "Can anyone help me? My game crashes as soon as I turn it on and it just came out of the box!"
"Sorry man, I don't know waddafuxupwit your game."
by smurfettte October 13, 2008
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