Top Definition
an innie and an outie get together. the outie sticks its bellybutton into the innie and begins to thrust. like regular sex, but no exchange of bodily fluids.
dude jim and karen have bellybutton sex. how kinky is THAT?!
by annie January 29, 2005
2 more definitions
when you have sex with a fat chick, and you accidentally stick your dick in her belly button.
alcoholic dude: "i had sex with a fat chick when i was drunk last night and i accidentally stuck it in her bellybutton."
other dude:"ew you had belly button sex ?"
by bellybuttonsexbabby October 21, 2007
sex with thee belly button
i had belly button sex with johnny
by travistein January 30, 2009

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