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When you put peanut butter on your hand and slap a guy on the face leaving a handprint of peanut butter. Invented by Andy Milonakis.
Vasily got me mad so I peanut butter slapped him while he was jacking off.
by DenisK August 14, 2007
When one has peanutbutter on their hand and yells "peanutbutter slap" and slaps them hard on the face
Man I gave him a peanutbutter slap because he wouldn't shut up!
by shambly March 23, 2010