A combination of Fat and Ass.

When you see a person with a huge fat ass.
Hey brother check out the ass on her, she has a Fass.
by Trickfatigue January 16, 2018
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dang she has a fass
by Rosieluv January 14, 2017
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a short way to describe someone with a fat a$$
whoa Mia has a fass!
by yarmyp4st4 June 5, 2023
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A word to describe a body position that someone makes after winning
I fass correcting.
by unafro individual May 6, 2021
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