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When you've been holding your pee for literally more than 3 hours so when you finally do release your pee, you don't have to push it out, it just flows.
Dude, I was at that party all night, and when I got home, I had to take a fat piss.
by Hollywood8245 November 03, 2007
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When you’re taking a fat piss and you’re there for so long you put your hand on the wall and say “Damn this is a fat piss”
I was taking a FAT piss yesterday. And it took like 45 minutes. My legs got tired.
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by VulpineDoge October 14, 2018
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