Somebody should track down the kind of naive film investors that would fund such craven idiocy and punch them squarely in their money bags. Reading the plot as outlined on Wikipedia, the movie isn't horror so much as a bad joke somebody made when they were drunk. Maybe they heard the "three story outhouse" joke and were like, "wait a minute... Eureka! People stitched mouth to anus! Just as soon as the room stops spinning enough that I can hold a pen, I'm totally writing a script!"
Give me a break - I've heard of some bad movie monsters before, but this. Actually, I guess the idea of a doctor crazy enough to think this is how a human digestion system works and was like, "duh, I gotta make a digestive system three people long because that's somehow significant" would be pretty scary. Although the scariness is blunted by the absolute silliness such a misconception would require, it's something you'd expect Hubert Farnsworth to be raving about between robot overlords and atomic mutants.
More likely what we're looking at here is a thinly disguised attempt to make scat porn mainstream.