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A pisstergeist is the name of an unexplainable phenomenon that causes one to have to urinate constantly despite there being no change in one's liquid intake.
Jeff: I can't seem to go more than ten minutes without having to piss like a mofo.

Dave: You're not a drinker are you?

Jeff: Exactly. I think I'm being haunted by a pisstergeist!
by Mick the Dick September 26, 2011
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