When your house cat both shits and pisses in your bed, purely out of revenge or defiance. Occasionally compounded, if the act in question takes place during the owner's absence, and the waste is subsequently left to ferment for an extended period of time. Named appropriately after the infamous feline "Sushi Bum-Bum". Third-Dan black belt, in the art of Turd Dropping.
"My cat dropped a Sushi SO badly, I had to wash the sheet three times!"