A turd that is large enough in length and/or width to tear the skin of your ass hole. Bleeding may occur, however it is usually not profuse. After you have experienced a Rim Rocker, the inner fibers of your ass may feel like they are dangling helplessly and may take hours to repair itself.
"Good God Henry," said I, "that steaming brick of meat that you planted into our lavatory is comparable to the Great Wall of China." But it was too late, Harry had died from blood loss.