The CDC classifies weight into a few categories such as under, normal, over, and obese classes 1 through 3. Class 3 obesity is what was referred to as "morbid obesity" previously.
The threshold for Class 3 obesity is a BMI of 40, for me that represents a weight of 267lbs (121kg). My current weight is 283lbs, and I'm losing at the rate of a few pounds per month.