Underass

Under the ass. When referring to the end of the year pants that girls get.

Let me sign your underass.

by me27 June 17, 2007

underass

Refers to the very short skirts that girls wear, which shows the lower section of their buttocks.

Dude, look at that girls underass! I'm sure I can see gash.

by hamstar... March 28, 2010

underass

ass that curls under

Did you check out that ladies underass?

by UnDeRcRuSt January 1, 2009

underass

Hind quarters visible due to a female wearing only a shirt, with no undergarments.

Did you see the underass in Lindsay's profile picture?

Underass is far better than underboob in my honest opinion.

by FIDDLEmeTimbers April 3, 2010