Much like the phenomenon known as underboob, asscups are those bottom parts of a woman's butt cheeks that can gloriously appear on that rare occasion when that dress she's wearing is just a little too short or those jean shorts ride up just a little too high.

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Johnny: Billy, check out that chick's shorts! They're so short, you can see the bottom of her butt!

Billy: Asscups, Johnny. They're called asscups.
by ChadFarthouse July 20, 2010
Top Definition
to cup the fart and hold over freinds mouth until they inhale the toxis smell making them gag
after that ass cup i threw up
by Drew wilhelmi March 28, 2005
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