Top Definition
Chugging beer in a porta-potty.

This is commonly practiced at public events where drinking is not allowed, such as parades or your little brother's soccer game.
Bro 1: "Damn bro, there are people everywhere. How are we going to get tanked without someone seeing us?"

Bro 2: "Fear not bro, we can just porto slam this 30 case."
by JJ Brisco July 12, 2011

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