When you try to walk into a bathroom to piss, but the door is closed and you almost run into it (usually only occurs when the door is located around a corner, etc)
Person 1: "Fuck, I just tried to take a piss, but the door was closed and I almost ran into it"
Person 2: "PISSBLOCKED"
Person 2: "PISSBLOCKED"
by Cockmeat McGillicutty March 12, 2009