When two or more people poop at the same time in the same restroom, preferably including conversation. Also, the phrase, "You sunk my battleship!" should be shouted when a portion of feces falls.
Also referred to as GP.
Jess: dude, you wanna gp?
Isabelle: Nah man, i gotta let it brew.
Ray: You sunk my battleship!
Zach: Another successful Group Poop.
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