Top Definition
1. The very means of slapping someone (or something) in the face (or elsewhere) with ones penis. derived from the sound it makes when contact is made.
1. WHOPACHA! (*screamed whilst performing the act.)

2. That bitch is gonna cop a whopacha in the face!

3. that n00b just got whopacha'd

4. OMGWTFBBQ! i just got whopacha'd
by Matt N May 05, 2006
6 Words related to whopacha

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