Top Definition
When a male zips up his pants after peeing and the front of shirt tail becomes entangled in the zipper and the zipper becomes stuck leaving a flag-like swatch of shirt protruding from stuck zipper.
I'm going to have to wear this piss flag until I get home and can un-jamb my zipper with Vice-Grips.
by wolfbait51 June 12, 2011

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