Upper decker dry docker

its where you turn off the water on the toilet before someone takes a poop and you take a diarrhea in the upper water chamber. Then when a person sits down to take a poo, it lands on the porcelain and sticks, then when they go to flush it shoots diarrhea out. causing a horrible situation

Man that was funny when billy gave her the old “Upper decker dry docker”, her trailer smelled like feces for months.