It's a dark comedy, very dark. It's also disturbingly violent in places, as well as being misogynistic. The most disturbing scene involves fellatio with a chicken leg from K-Fried-C that substitutes for an attached penis. There are hints of a near-incestuous relationship between Chris and his sister, Dottie. Dottie is beautiful, though a bit disturbed. But who wouldn't be living the way she lives with a father who cares nothing for her (to the point where he is fine with offering her as a "retainer" to Joe for services rendered), and a step-mother who respects her so little that she walks around the house naked in front of her. Chris seems to care more about her than anyone else in the family, including her real mother who, as she relates, tried to kill her when she was a baby. But again, there is that feeling that something isn't quite normal between them. Well, they did sleep together when they were children. Maybe they did more than just sleep.
I gave this a 9 for being funny, intriguing, thought-provoking, and for going where few movies have the guts to go. If you don't get offended easily, you should see it. It's a movie you will be thinking about for days. And if you're a woman, you may never eat chicken again.