Faulty Fuel Pump
The act of somebody defecating into another person's asshole and after 2 days, they trade. This repeats until a person cannot fit any more in their asshole.
Person 1: Hey, want to play Faulty Fuel Pump?
Person 2: Sure, be prepared to clean up, things are going to get messy.
Person 2: Sure, be prepared to clean up, things are going to get messy.