A subspecies of turtlehead
that occurs when the sphincter has been successfully employed for a time in confining a turd to the rectum. As control is gradually lost, a tiny aperture appears at first, allowing for only a very thin extrusion of feces. As the butt-muscle fails in the continued absence of a toilet, the aperture quickly grows in circumference over the next inch or two of escaping dookie
, creating a rough cone-shape, resembling the head of a rat more than a turtle.