Most Helpful Guy
"Thick" is a quality most guys like. It means you have a nice butt and boobs, and look very nice. It only describes (slightly) heavier girls, but it means anything but fat. it's a compliment, as long as it isn't from a stranger.
Most Helpful Girl
Depends on the guys thought of thick. Sometimes guys seem to think it’s a compliment. Such as I had to be explained when called fat it wasn’t F-a-t it was phat. Sometime though it does mean they think you are heavy. I call a guy on that shit and tell him to clarify.