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The act of shotgunning a beer whilst urinating - oft completed outdoors. Can be completed as a double or triple when two or three beers, respectively are shotgunned during a single stream of urine.
Hey Charles, ya bitch, I've gotta take a piss let's go do a pee gun - try to avoid the public urination charge this time - dick.
pee gun by CharlesIsMyBitch September 7, 2010

gatling gun of pee 

this is what happens when you are peeing and you suddenly lose control of your pee stream and little drops come out at hi speed.
oh god this will take a while to clean up. DARN YOU GATLING GUN OF PEE