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The leftover urine that drips onto the pants or shorts after zipping up, giving the impression that one has pissed himself, or the water from a faucet that somehow ends up on said parts. Runoff is commonly hidden or removed by wearing long shirts or utilizing the hand-dryer while no one is around.
Bill: Oh hey man looks like you just pissed your pants!

Sven: F*** runoff!
by Waldosziak February 28, 2012
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