look up any word, like timebomb:

1 definition by ChadFarthouse

 
1.
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.

*brought to you by the guys at www.bonerlish.com
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