underabs 

The hips, butt, and vagina/penis of a woman/man.

Underboob is good but underabs are essential.

underabs by ess kay November 15, 2013

underasian 

An smoking hot underage asian girl, jailbait so irresistible that it is all but guaranteed to land you in the slammer for some 'hard' time.

Bob - Did you hear about that party tonight at doug's place?

Rick - Yeah, there are supposed to be a bunch of underasians there..

underasian by eatsleepobey December 18, 2009

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.

underass by hamstar... March 28, 2010

underass

ass that curls under

Did you check out that ladies underass?

underass by UnDeRcRuSt January 1, 2009

Underasstimate

When you think your ass will fit in to something i.e. pants or a small space.

I wanted to get these new skinny jeans, but I Underasstimated and had to get them several sizes up.

Underasstimate by Gingerella August 20, 2012

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.

underass by FIDDLEmeTimbers April 3, 2010

Underass

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

Let me sign your underass.

Underass by me27 June 17, 2007