People make themselves fat with all the junk food and unhealthy food they eat, you can just eat healthy and loose all the fat. Thick people are that way, even if they try to loose weight the cant loose much cause their physique is like that.
Everyone has their own opinion. I don't think you'll find a straight answer. These are words that are defined by their general community. However, we have a lot of different communities using the same words. So, in reality... they can mean anything related to weight.
either way thick and fat is sexy especially when your proud of your weight and stay confident and love yourself for you trust me alot of people love women who love there body and are truly confident no matter what shape or size they are i really cant tell you the difference cause either way you still look beautiful just saying