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gorilla thump 

Using the force of a gorilla behind a thump of your appendage upon another person's head.
Last night I took out my Wang and gorilla thumped this girl's forhead.
gorilla thump by clitcommander69 November 10, 2009

Gorilla Thumb 

A penis - particularly a penis that is curious and/or searching for something. The gorilla thumb might be particularly hairy or thick, although not necessarily. Ideally, it doesn't have a fingernail.
I'm tired. Get your gorilla thumb away from me.
Gorilla Thumb by bullfrogboy January 20, 2009

Gorilla Thumb 

Jessica: "Davon had such a gorilla thumb and I wasn't ready for it!"
Gorilla Thumb by JimboSlice13 July 14, 2017