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The balance of fat and muscle on a body. Particularly when the individual's head is is proportional to the fatness of the body.
A: "Man, you're a heifer!"

B: "No, I'm perfectly fat, get it right!"

A: "Wow, you've lost a lot of weight!"

B: "No, I'm still perfectly fat. Once you're perfectly fat, you're perfectly fat."
by FBL aka MC Brains August 06, 2010
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