A sex act performed amongst the geriatric. During coitus the contents of one partners colostomy sack is emptied onto the back of the other partner. At that point the consumption of said contents is optional. Makes for a fine rainy day past-time. The derivation of the term is credited to two drunk idiots at Monty's Crown in Rochester, NY.
Following the early bird special at Dales Rib Haus, and copious ingestion of ex-lax, Edna and I adjurned to the bungalow for a night rife with passion and all you can eat wet back platters.