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.