What *is* that thing hanging downbetween her legs?
Belly fat.
large camel toe?
LOL
Q. “What *is* that thing hanging down between her legs?”
A. That thing is what is called a pannus (Latin for apron). Some people with morbid obesity develop so much abdominal fat that it hangs like an apron from the abdominal wall, in some cases down to the knees.