The act of applying peanut butter to your hand, and slapping someone across the face. It is most effective when performed on someone with a mild peanut allergy.
Person #1: He's such a jerk, next time I see him it's jiffy slap time.
Person #2: Use chunky, smooth just wont cut it.
Person #2: Use chunky, smooth just wont cut it.
by Ellis Lee September 27, 2011
Get the Jiffy Slap mug.