Super Morbidly Obese?? or Morbidly Obese

Where can I go to find out what the definition of SMO and MO are? and are there any categories above SMO??? Just curious.

This is the chart I have ... hope it helps. less than 18.5 Underweight 18.5 - 24.9 Normal 25.0 - 29.9 Overweight 30.0 - 34.9 Obese 35.0 - 39.9 Severely Obese 40.0 - 50 Morbidly Obese over 50 Super Morbidly Obese