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A moron, who, at a urinal,pisses toward the side, thus is likely to piss on a) his leg or worse b) pissing on your leg.
"Dude your pantsleg is all wet."
"Yeah I was beside Irvin in the bathroom."

"Yeah he's a fuckin sidepisser."

Piss, urinate, pee
by catcherholic July 21, 2016
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