When a girl who has clearly gained relationship weight has decent amounts of sex, resulting in belly bulge.
Guy 1: Hey did you see Hayley?
Guy 2: Yeah, she got a major case of fuck belly.
Guy 1: Yeah, that cow's being pounded.
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1) The process of having sex with a fat chick in the Naval. 2) Drawing out before ejaculation and letting it flow over a chick's belly.
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To fuck someones belly button and cum into it.
Me and Stephen fucked alot last night, we even belly fucked
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