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When you look at someones Rear end and notice its not as smooth and Delicate as it should be.

Also, when their derriere is guininely not normal.

Sometime used as an expression to shout when angry.

Finally, it can be used as an insult. (similar to Ass-hole)
Dude, her curves caught my eye until i noticed her Tarp Ass.

"Dayyyyum Ray Jay, Did you see her tarp ass."
"That just ain't right"

TARP ASS! I just got stuck hanging out with all these hipsters.

You are such a tarp ass. i cant believe you would goto chipotle and not invite us.
by 12345wes October 22, 2010
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