the piss used to clear the penal shaft of cum or shit after sex or jerking off. a woman may use the same method after a deposit in her forward hole.
during the afterpiss I hit the toilet tank with a cum/piss mixture due to a semi and the fact it took a moment to figure the combination pressure-to-backsteps ratio needed to ark the fluid into the bowl.
by the mac al March 1, 2006
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when u go pee and after u already put it back in your pants it decides to trickle a little more out. leaving small wet spot on your pants that quickly evaparate.
did u see that guy coming out of the porta pottie he had afterpiss on his pants. thats gross.
by firstteam June 24, 2009
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Its when you are done taking a piss and you walk out of the bathroom and a little bit more pee comes out
O my god jake had such a Afterpiss it went through his pants
by goodwillhunting September 10, 2011
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