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A B cube is a woman so big she could be a whole buffet. She’s got big boobs, a big butt, and a big belly, all B’s, like a fat cube of meat.
My aunt is a B cube. She eats a whole pizza by herself and still has room for dessert.
My cousin calls her boss a B cube because he can’t fit in the office chair anymore.
My mom says I’m a B cube in training because I eat like a horse and still have a snack at midnight.