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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 27, 2010
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Apr 22 Word of the Day
When you eat dirt for the first time and leave your family to build a shack in the woods
Bro since I got dirtpilled on Tuesday I have made sooo many worm friends and made them soo many little houses to get married in. Me? Lonely? No you’re the lonely one u lawn owning freak
via giphy
by ecogoth December 30, 2020
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3
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 03, 2010
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4
Under the ass. When referring to the end of the year pants that girls get.
by me27 May 28, 2007
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