Verb. To procrastinate or find unimportant activities with the purpose to simply annoy people for your own pleasure. Such activities include; aimlessly wondering around in someone's office, blablabla-ing with friends online while munching on food for the purpose of munching or otherwise focusing on being an nuisance.
Q: Honey why are you walking around in my office with a piece of KFC stuck in your mouth while blablabla-ing with your friends?

A: Oh I'm just fatassing around

Q: Well don't it's annoying.

A: I know. That's why I'm a fat-ass.
by UncleTomTheGreat August 3, 2017
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a tribe in trinity beach, whom gave up on being hot and attractive for summer and decided to move on to plan B which was create a tribe retreat to a cute little hut and eat food, fuck society with cute boys, the ass means they have a nice ass!
the fatass tribe strikes again in another community
by fatass tribes August 26, 2014
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A fatass is someone with overlapping lovehandles, multiple chins apon chins, and man tits that are triangle shaped due to gravity. They never want to get up, unless food is offered, and there fat giggles when they breath, walk, and talk.
Eric ur chins are giggling and your not even moving, ur such a fatass.
by Greg Fat Man February 11, 2006
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In my state of fatassness, I was insanely hungry for days but did not want to move my large behind.
by Mutant Donkey Babies May 22, 2010
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1. an ass that is fat
2. One who is fat in general
3. An insult shouted among annorexic girls when one of them breaks the 80 pound mark.
"Cartman, you fatass"
"EWWW!! You are, like, over, like, 81 pounds, you fatass!"

by Fatass July 21, 2003
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