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A gay male, usually a gainer, who prefers having his belly fucked over penetrative sex.
Did you see how fat Seth got? He's a total belly bottom.
by saintventre February 19, 2014
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When someone's bum is so flat it runs at a parrallel to their stomach line.
Michelle has such a pretty face, shame she's got such a belly bottom, she's such a pancake.
by SnewbDogg August 08, 2017
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