Thick is one BIG MAC away from fat.
Just kidding, there are women that are just more developed in the right places. Then again, there are some women that are borderline fat that say they are thick. They need a reality check.
Thick is beautiful. If a woman has a nice body, but she has a little more in the butt, thighs and breast...that's thick. Stomach fat does not make you think. Beer gut is not thick. Double-chin is not thick.