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It just means "what the fuck" but goes more toward how people say it.

Some people are afraid to actually say the word "fuck" and say "what the f--" and cut off right there. Whatduf seems to be the way people pronounce it when they don't want to feel guilty about saying the actual word.
Dude... my teacher thought I was texting in class and grabbed my dick instead.
by ieatedyourrice July 24, 2010
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