It was a skillet fried pork patty, like sausage between 2 pieces of white bread. Jack or Sarge would ask if you wanted it mild, regular, or hot. Sometimes we would tell them to stand one on its end, meaning really hot, and we would take it back to the dorm, for some unsuspecting newbie to burn their lips on.I work with one of the sons of the original owner. I never got a pig burger but I am told they were excellent.
It was so spicy, it would make your nose run and bring tears to your eyes. There was nothing there but a pork patty, 2 pieces of bread, and sauce. Best 26 cents I spent in college. Also, on the wall it was spelled pigsburger, with an "s."