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1 definition by WNBM

A bottom stamp is a sarcastic phrase referring to factious or metaphorical marking that would mean that person is obviously or at least a stereotypical bottom (someone that prefers to take the submissive role in sex or being gay the one that enjoys anal penetrated).
Brent: Hey, is Chris a bottom?
Andrew: Duh, you didn’t see his bottom stamp across his forehead
by WNBM August 20, 2009