I have been seeing this film billed as possible the grossest horror film of all time... so my expectations were fairly high. I had been hearing the hype and understood the premise; a deranged surgeon kidnaps some victims and surgically attaches them ass-to-mouth, forming a conjoined being sharing one gastrointestinal tract.
That means that each "segment" of the construct after the first is forced to eat the shit of the one ahead of it.
The film had a campy beginning. Two girls are in Germany doing a "European Road-trip", when they get lost in the woods and blow a tire on their car. They wander through the woods until they come upon the house of our deranged surgeon. He manages to drug one via a glass of water, but the other spills her drink, forcing him to knock her around a bit and get her with a syringe.