As a hairstylist I've  seen this once or twice in my 16 years in the industry.  This is what happens when they're  so fat that the neck disappears and the second and third chin start to form because the fat just gets pushed up to the occipital bone and creates a fat roll. It's  fucking gross and it's  difficult  to cut their hair when they have this. And the one or two instances  I've  encountered this it smells because they are constantly sweating so the hair never dries .