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A semi erect penis , usually shows itself in the morning , when you first wake up. Often makes it difficult to urinate as your aim is slightly off and youre half asleep.
Shit man , just pissed all over the floor coz of this fucking pisshorn!
by James November 01, 2004
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When you wake up in the morning with an erect penis and have to use the toilet, you have pisshorn.
-"Mate, I've got pisshorn!"
-"Use the toilet, then!"
by Proper Socks September 04, 2013
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