Versus is a great film. Totally over the top and no plot to speak of beyond "This guy might be a bad guy, those guys certainly are, here's a butt load of zombies. Fight!". Perfect for watching drunk.
I would also recommend Aragami and Azumi by the same director, Ryuhei Kitamura. (Azumi 2 has a different director, and isn't quite as mental - you've been warned!)