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When you're on your phone sitting on the toilet for too long and you develop dimples in the shape of the toilet seat on your butt. Usually looks like a square ass
kid 1: dude the English teacher has bad toilet butt

Kid 2: ew no way that's nasty as hell
by Meowkat3 April 03, 2015
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The bottom 25-50% of a girl's exposed butt cheeks when she wears tiny shorts. This skin is rife with bacteria from when she has sat on a toilet, thus, a breeding ground for spreading bacteria to every surface.
The booty-shorts-wearing girl spread e-coli with her toilet butt.
by Mathgie November 03, 2017
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