thass; the area in which your ass and thigh join as one. there should be definition between the two, a thigh... then your ass, creating a "shelf" if you will. but when you start to gain weight you loose that definition, thus creating the infamous thass.
*cousin to the kankle

"Look at the thass on that!"

thass by Miss White of the WFSU crew AKA Karena July 18, 2006

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Thass; the thigh / ass crease or more importantly the lack there of.

Her ass has become one with her thigh , where there was once once a seperation there is no more.

thass by Jesse May 13, 2005

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Thass

where ones ass and thigh look like its merged together

Look at the thass on him, he shouldn't wear football pants.

Thass by ilovemanning10 October 26, 2008

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Thass

That small area on either a male or females body,that is right between one's ass and one's upper thigh,could be the crease or just that area that on some people just blends together.

Oh that hurts, a spider just crawled up my leg and bit me on the thass!

Thass by 4you May 7, 2009

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Thass

The are area of the body between your ass cheek and your thigh....

Thass nice.

Thass by TIVA January 25, 2016

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