What’s the difference between thick, big boned, and fat? [#THESCENARIO]

Tonight's scenario comes from a female listener, “What's the difference between thick, big
boned, and fat?”

I'm just confused by what men mean when they say "oh she's thick" or “oh she’s big boned" because I hear some women who I would consider overweight calling themselves thick. I know this is a shallow question but I was just wondering.

So, let's help this woman out what is the difference between thick, big boned and fat ?