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A person with huge boobs and a body that looks like it's been hit by a truck. They also tend to eat like a horse.
My cousin is a B. T. M. G. She eats pizza for breakfast and still fits into her jeans.
At the gym, I saw a B. T. M. G. lifting weights like it was a punishment.
My mom called me a B. T. M. G. because I ate three burgers and a milkshake.