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.

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underass

ass that curls under

Did you check out that ladies underass?

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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.

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Underass

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

Let me sign your underass.

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