Rip a Piss Share definition Flag When you have held in a piss for too long and it spurts out at a high velocity due to the pressure that has built. It can also simply refer to the need to go pee. A'ight, guys, I'm gonna go rip a piss! Be right back. Rip a Piss by Liddleadlien September 3, 2017 Get the Rip a Piss mug.