One of the first things I noticed is the frequent change in the genre of music. First it is gangsta rap, then punk rock, then heavy blues, then finally your metal track. It was not your classic grindhouse soundtrack as the Butcher Brothers sought to do things their own way. There is a 50th birthday party for the Mom of the biker gang "The Crew." They get her a couple of female strippers, very thoughtful. Cody's ex-girlfriend Michelle is there with her new bf which she kisses on in front of Cody, a real "B" word. She leaves and returns covered in blood. While laying in bed, passed out, one of the bikers decides to "get her while she is still warm." Michelle awakens while getting felt up and wants more. She turns into a demon/zombie and bites off a hunk of flesh. The screams attract the rest of the gang. One guy pulls Michelle off the biker and holds her down on the bed, then Michelle's sister Megan comes in and attempts to pull the guy off the monster Michelle.
The events are confusing and the movie waits too long explain what is happening.
Pluses: The bad guy had his own music as he whistled in an off key "Pop Goes the Weasel" although it wasn't used again.
The zombie/demon Michelle possessed (pun intended) that certain "Evil Dead" quality.
Dead people have a sense of humor.
Home invaders are from the "1950's."
Negatives: Not a movie for those who take their films seriously.
Sex, nudity, F-bomb.