An act in which multiple male drinkers go outside to urinate at the same time. It must be done outside, preferably on a straight stretch of bush so nobody takes an unintentional gander.
It is common courtesy to yell "TEAM PISS" before you need to urinate. Nobody is to be excluded from a Team Piss, so you must yell loud enough to inform all present drinkers. Whoever else needs to urinate is obliged to stand up and join you in yelling "TEAM PISS", until all drinkers are aware. If nobody responds, you are free to piss by yourself outside or use indoor facilities.
Male Drinker #1: TEAM PISS!!!
Male Drinker #2: Thank god, I've been holding it in. TEAM PISS!!!