Top definition
When three men with full bladders pee perfusly on a unexected bystander and or sleeping person. This resembles the three rivers in Pittsburgh.
Person 1: "hey guys
Person 2+3:"whats up"
Person 1:"Josh passed out on the couch lets give him A Pittsburgh Three River"
Person 3:" haha yeah!"
Person 2:" he is going get drenched in piss"
by Cpat, CC, borris March 21, 2013
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Dirty Sanchez Plush

It does not matter how you do it. It's a Fecal Mustache.

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