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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When people (especially cops) stand around not doing their jobs but instead eating food and/or drinking coffee.
Joe: Wow, this traffic is really backed up. You'd think the cop would be directing all the cars.
Billy: No, he's too busy fatassing. Look he's got a donut in one hand and a coffee in the other!
by LuLuAiC May 3, 2009
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When something gives way or breaks due to a sudden increase in weight that was put upon it.
Wow! She really fatassed that beach chair! We had to throw it away!
by sporto March 28, 2006
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A person who is extremely overweight and won’t stop eating.
Jaron Schiowitz is a perfect example of someone who is fat. He is also a really big fatass.
by D’TRIO May 11, 2020
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verb, past tense
(fat-ass-ed)

to waste time, to do nothing for a long period of time. the act of being a fatass.
Ryan: Wow I haven't done anything today.
Hannah: Same, I just sat at home and fatassed.
by Hannah412 February 7, 2009
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Simple really, fat+ass+massive. Hence the word fatassive
"Wow, look at that fatassive chick!"
by Scott "fmg" L February 12, 2006
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