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!
Dave: You're not a drinker are you?
Jeff: Exactly. I think I'm being haunted by a pisstergeist!
by Mick the Dick September 27, 2011