Definition

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”

Example Usage

I was taking a FAT piss yesterday. And it took like 45 minutes. My legs got tired.

Origin

Urban Dictionary

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See “Fat Piss” in Corporate Speak, Gen-Z Slang, Pirate Speak, and more.

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