Most Helpful Guy
When a guy calls you "Thick" it means you have sexually attractive to the opposite sex. You got (Please excuse my language), Ass, boobs and a good curious body that a lot of guys would love to have a girl call his own.
The question is hard to answer because I do not know your ideological way of thinking. Some girls loves it when a guy compliments her figure , some girls find it sexists and misogynistic. So it really depends on if you want to take it as a good thing or bad thing.
Personally, as a guy, naturally, its gonna be a very good thing, but thats just me.1
Most Helpful Girl
It can be bad and good. If the person is calling you thick instead of saying fat then it's an insult. I can't even count how many times I've heard people use the words thick or curvy to describe a fat person, I guess to some people it's better than telling someone they're fat.
You're not oblivious, you know your body type. If you have a fat stomach or muffin tops you're not thick, you're fat. However if you have a small waist/flat stomach but bigger hips and thighs you're thick. From that you can deduce whether it was a compliment or someone politely calling you fat.0