Gunk or paste that grows between a guys balls and lower anus, when he does not have a bath for a week or more. Or the remnants of poop and sweat buildup.
1. Man you smell so bad, you'd gotta have head cheese growing down there!
A type of food that the big brother of some insane hick is good at making. Source : The Texas Chainsaw Massacre (old version). What is head-cheese? Use your imagination if you dare...