Cannibalistic
Humanoid
Underground
Dweller

That's what it stands for. It's the name of a movie made in the 1980s. Basically in the movie a bunch of homeless people living in the sewers of New York get exposed to radioactive waste and become mutants with a taste for human flesh. It's actually a really bad movie, but it's so bad it's funny. So if you're bored one afternoon, have a couple of hours to kill, and have access to a website that lets you watch movies online, check out this movie for a good laugh.