Deuce in Dry-Dock
The act of shutting off the water valve to a toilet, completely draining all water, then leaving a turd in the bottom of the bowl.
"Phillip gave me the keys to his estate and asked that I mind his English Mastiffs in his absence. I fed the hounds, ate his scones, and left a Deuce in Dry-Dock knowing this would elicit a chuckle from Phillip and scorn from his mistress."