Cmv: curvy does not mean fat.:
In my opinion, curvy denotes an hourglass figure with with hips, boobs, and butt that stick out. Curvy is healthy body type that people have  naturally. Fat isn't healthy. Curvy women don't fit into the "skinny" category because of their assets, but also aren't an unhealthy weight. I feel that it is inappropriate to call women curvy as a nicer alternative to fat because fat and curvy aren't the same thing. I feel that it is unfair and misleading to actual curvy women for fat women to use the descriptor curvy. That being said I have nothing against someone for being overweight.

EDIT: I want to thank all the people who replied. I do realize that I may not hold the majority view. I should have used the word overweight rather than fat. Humans do require a percentage of body fat to be healthy. 