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

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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

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The Urban Dictionary T-Shirt

Soft and offensive. Just like you.

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The Urban Dictionary T-Shirt

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sex with thee belly button
i had belly button sex with johnny
by travistein January 30, 2009

The Urban Dictionary Mug

Lotsa space for your liquids.

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The Urban Dictionary Mug

Lotsa space for your liquids.

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The Urban Dictionary Mug

Your favorite word on a white mug.

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The Urban Dictionary Mug

One side has the word, one side has the definition. Microwave and dishwasher safe. Lotsa space for your liquids.

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The Urban Dictionary T-Shirt

Soft and offensive. Just like you.

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The Urban Dictionary T-Shirt

Smooth, soft, slim fit American Apparel shirt. Custom printed. 100% fine jersey cotton, except for heather grey (90% cotton).

Buy the t-shirt