"Phatass" is an internet slang term derived from "fat ass," which is used to refer to someone with well-developed or ample buttocks.

Or colloquially used to describe someone who is perceived as socially anxious and acting foolishly.

1. She got that phatass!
2. You're a phatass...

phatass by Radin Happier October 6, 2023

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phatass

Someone or something that shows the qualities of being phat.

"that was a phatass film"

phatass by dw March 23, 2003

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Phatass Syndrome

A very debilitating state of mind where the person believes that he/she is popular or well liked by people, even though they are morbidly obese and extremely obnoxious. This person will do almost anything to make themselves seem cool to others, which usually ends up making the victim look like a loser. Symptoms include, posting picture of you "smoking weed" (when it is actually your vaporizer, constantly stalking people to "hang out" with them, and being nice to pretty girls and expecting to get laid because of this.

Oh no, it looks like Jimmy has developed Phatass Syndrome and won't stop texting my girl, I guess i'm going to have to beat his ass.

Phatass Syndrome by The Commision69 April 1, 2015

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