I cannot recommend this one highly enough. It is, somehow, every single classification of B movie combined in a single coherent whole, each one allowed to shine fully in its turn, without detracting from the others or becoming disjointed. It combines:
Idiot buddy comedy
Raunchy teen comedy with tons of nudity for no reason
Cheap Western karate martial arts B-movie
Cannibal cultist cheap horror movie with zombies
Shlock action movie with guns and bazookas
It is the ultimate. It is the pinnacle. Watch the fuck out of this movie.
There's... a lot going on in that movie poster. So much so that the man in the bellbottoms and high heel boots shooting an AK right at me is the least interesting.