Is being thick the same as being fat?

Is calling someone thick just a nice name for calling them fat or chubby?

I think I'm fat because I have a big butt, thick thighs and wide hips, but when I tell people that I think I'm fat they tell me I'm not fat just thick and well proportioned.

When people guess my weight they usually guess 30-40lbs under what I really weigh and my Mom says it's because my weight is well distributed in like my butt, thighs, hips, chest area.

What constitutes as being thick to you? And would you consider a chick like me to be thick or just overweight?
Is being thick the same as being fat?
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