Duncan's having a crappy day. It gets worse when he discovers a strange demon lives in his lower intestines. This creature (who Duncan names Milo) is hell bent on killing the people who have been causing Duncan stress. Can Milo be contained? What happens to Duncan if Milo is killed? How does Milo fit up there?
Some of these questions will be answered, some are best left not thought about.
Not quite as gross as you'd expect. I've you enjoy the films of Frank Henenlotter you've seen more disgusting things.