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Derived from the term Bladder Infection, a bladder erection is when a male has to urinate so terribly badly that his penis actually becomes erect.
Dude 1: Dude, is your dick hard? come on man we're in the men's locker room

Dude 2: Sorry man, I forgot to piss this morning when I woke up and i've been holding it in all day.

Dude 1: Oh so it's just a bladder erection? Well thats cool, just piss in the sink like everyone else.
by taco49er November 29, 2011
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