1 definition by Gravy boat

The act of placing ones schlong into the belly-button of a person.
Marc: My belly button is tight like a tiger!
Dwayne: I am turned on.
Marc: u wanna try buttoning.
Dwayne: Okay, I'll ask Martin for a condom
Martin: GO-GO-KARTIN
by Gravy boat August 16, 2011

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