Top Definition
etymology : (1) gonzo - origin unknown (2) slap - Middle English slop, from Middle Dutch; akin to Middle Dutch slippen to slip

definition : an assault on a close friend or acquaintance which requires the antagonist to masturbate, then lick his or her palm, and complete the maneuver by slapping said colleague across either cheek of the face open handed
I heard Dave put a serious gonzo slap on Steve after he stole his jacket. There's a handprint and everything.
by The Gonz September 19, 2004
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