When a person is born with the parts to form a butt (butt cheeks) but no flesh ever properly forms in it, so that the prson doesn't have the natural roundness of a butt and are therefore forced to sit on the extension of their thighs for lack of a natural butt. Or in simpler terms- lack of butt meat.

Hold on, is that Crystals's thighs or just her vestigial buttsack that's creeping from the top of her jeans when she bends over?

vestigial buttsack by Zoraya M May 19, 2008

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butt-skank

A girl whose lack of worth is not outweighed by the fact that she is willing to offer her rectum for hard anal penetration.

Jenna's the kind of buttskank who staggers home from frat parties dripping cum out the asshole.

butt-skank by katey December 12, 2004

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buttstonked

Being so twistedly fucked up (extremely inebriated in some form) that you literally can not and do not want to do anything.

X: Dude, that party was intensity in ten cities!

Y: Totally so dude, let's roast these righteous herbs and get thoroughly buttstonked to celebrate!

buttstonked by KyleFromTheAmandaShow March 24, 2014

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peeing your buttsack

When someone has taken a pee and it has overflowed the buttsack.

Hey man, quit peeing your buttsack!

peeing your buttsack by The real mike jones November 14, 2014

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