Dropping a heavy weight such as a large rock down the ventilation pipe of a Port-a-Potty while someone else is taking a dump. The splash will paint their rear end with blue goo. Popular as a practical joke in the military, where Port-a-Potties abound.
Hey, Jim has been in the shitter for a long time, let's get a big ass rock and smurfhole that motherfucker!
by skinny79 August 09, 2010
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