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!"
A point blank, bare assed fart to the lips.
"Can I give you a mud kiss on the lips?"
"Yeah! Where else would you give a mud kiss?"
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