yes it's a southen version of white castle.
If you have never seen a white castle or Krystle there little hamburgers about 2 1/2 on one side and really thin. Square buns and even matched cheese. They have little holes in the meat so it cooks easier. Ohhhhhh they even come with grilled onions.....Hence the lamen term gut buster. Can also be called sliders"buy em buy the bag"