Top Definition
The amalgamation of "masterpiece" and "ass" - essentially a masterful ass. This is applicable to any female that has a lot to bare with her derrière.
Jessica Biel has an ass that won't stop! What an assterpiece!

Even in her older state, J Lo still has a mighty fine assterpiece protecting her backside.
#nice ass #sexy #ass #butt #backside #hot #awesomeing
by P. Britt January 28, 2011
the wonderful paintjob that one gives the toilet when they have explosive diarreah
I painted such an assterpiece today that I thought I was Michaelangelo.
#shit #hanes paint #spatter #splash up #poop
by Johnny Tats December 10, 2007
A magnificient ass.
ONLY ON WOMEN

(Ass + Masterpiece = Ass-terpiece)
**Note**

This is NOT "Booty" or whatever the fuck word people use when they mean big Fat ass.

Check out that woman, she has an ass-terpiece
#ass #masterpiece #butt #women #chaos
by Chaotic J February 20, 2009
Used to Describe The Most Amazingly Awesome Ass on a Woman

(Ass + Masterpiece = Ass-terpiece)
Look at her ass...that is an Ass-terpiece
#ass #butt #piece #sex #chaos
by Joe Chaos April 17, 2009
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