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The tightening of the urethral sphincter to prevent the flow of urine. Increased blood flow to the penis constricts the urethra so you don't piss yourself in your sleep.
Sarge: "Holster that weapon private!"

Pvt P.P: "It's a defensive boner sir! I really have to pee!"
by IamRob September 02, 2017
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Sep 11 Word of the Day
when you're hungover as shit after a spending a night drunk as a skunk
I'm hungover as a duck let's go get some grub
by pokeythepony June 25, 2021
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