It looks like Battle Royale, Night of the Living Dead, and Kiss Meets the Phantom of the Park all gathered in the Troma Studios' living room for a giant orgy, and this was their lovechild. A second hysterical review here, but be warned, this one has one screenshot involving toplessness. Just in case you're at work. ;)
The only thing I can say is... this movie is SO over the top, the DVD comes with a built-in drinking game. Seriously. I'm infatuated.