Top definition
A congenital deformity in which the buttocks can open up like the shells of a clam, with anus inside as a clam would be inside clamshells.
He dropped his shorts and then made everyone in the locker-room pass out from the sight of his clamshell anus.
by wiginpen February 15, 2004
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Dirty Sanchez Plush

It does not matter how you do it. It's a Fecal Mustache.

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