The act of two sexual partners sitting on a single toilet with one sitting on the other, the top half shitting through the legs of the bottom while they themself drop dookage.
Also known as the double decker Blumpkin, is a position where one defecates into the toilet bowl and the other receives a blow job while pooping in the toilet tank.
Shelly gave me the steamiest Double Blumpkin on our Honeymoon getaway last week.