A reference to a scrotum that is very loose and elastic-like. Could occur in warm bath water or any other situation in which your privates are very warm and stationary.
When a guy and a girl sit at the opposite ends of a bathtub and the guy turns around and puts the water spicket up his ass. Then turns the water on full blast and leaves it that way until he is so full of water he can’t hold it and the pressure is pushing him off the spicket. He then turns around and blasts his girlfriend with his ass water.