Top Definition
A piss mortar is when you go to the bathroom or wherever else, and instead of aiming your gear downwards while urinating, you aim upwards so it goes way up and then down into the bowl or onto the ground. Feels good man.
"Dude, earlier I pulled off a perfect piss mortar while listening to Sting. I felt so manly."
by Peshka March 24, 2010

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