Perhaps the worst of all boners, this
boner occurs when one really has to piss. It normally appears
during what was originally an uneventful walk to class, or whilst playing a friendly game
of Parcheesi with some bomb-ass broads. Only goes away
after relieving oneself...
Control your fluid intake, you idiot. No one wants one of these
bad boys to pop up in the middle of nowhere.
"Dude you ready to go now?"
"Can't brah; I've got a raging
boner of the urinary variety.
"A urinary boner?!? I understand..."