How do you classify obese?

Hello again, ladies and gentlemen! I was just looking over some old questions and in some of the questions the word, "obese" popped up. Now, when people say obese, are they going by that chart that hangs in every health class in America or do they mean someone who is rounder than a hoola hoop, has trouble walking and breathing at the same time etc. etc? This goes without saying but, how do you define obese?

And... go.
How do you classify obese?
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