A human turd so massive, that it literally fills the entire base of the toilet pan leaving no water showing at all.
Weighing in at a minimum of a pound and a half and having the same volume as a coconut .....if it was made from a pile of sausages.
Usually the result of eating a large amount of meat protein and starchy vegetables followed by extended periods of sitting and resisting the urge to defecate - truck or taxi drivers, gamers etc - which compounds the end product.
Me: "honey, where his the plunger?"
My wife: "under the kitchen sink, why?"
Me: "I've done a pan filler and it won't flush properly"