No skeleton, something that 'looks like' a mouth, no eyes, no nothing - Except for 'meat like' flesh.
My guess is that its a plant, or root which has swollen a lot because of all the sewer water.

Employees at the Huddle House had been having problems with the restaurant’s drainage line clogging up and when plumbers came by to check on the problem they found that some unknown species of animal had apparently crawled through the city sewer lines toward the Huddle House until it became lodged in the line just short of the outside clean-out plug. When a worker spotted the plug, he grabbed it and began pulling it out. And he pulled and he pulled and he pulled until an eight foot long, white, skinless, eyeless snake-like creature emerged.