One with which whom's ass has become large. Not by means of fitness but by means of laziness and unhealthy eating.

The term originated from disputes about female's butts and whether they were nice or not. just because it was large doesn't make it nice because some girls get large butts from sitting on the couch and stuffing their face with "Cheetos."
That girl doesn't have a firm ass, she has a Cheeto Butt.
by trickdizzle September 4, 2013
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April 17th is the designated day for sticking Cheetos up your butt, posting it on your only fans, and making hella money off it.
Guy 1: Yo today's April 17th, you know what that means..

Guy 2: Oh shit it's Make Money Off Sticking Cheetos Up Your Butt Day already??? Sick.
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