I Was under the impression that a belly bester was another term for "gut-shot" or "inside" straight draws...in otherwords, 45_78 need the 6. A Double belly buster (one of my fav draws) would be you hold 45 and the flop comes 2 6 8... meaning you need a 7 or a 3 to make your straight...this is a good hand, becuase when you make your straight, its disguised quite well.