Gamon means the person is phony, full of shit or basically has no idea.
Friend 1: That Jack, he talks shit.
Friend 2: Yeah, he is a gamon cunt.
by Holden M. Caulfield December 30, 2005
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We're you are in the bed room and your partner sneak attacks you with a joint of gammon and beats you
Gammon spank

You are in for a gamon spanking
I am going to gamon spank you
by Stompfish September 26, 2017
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