Yo mama is so fat that she is not wrong when she says the world revolves around her.
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Explanation
Explain Bear
Alright, listen up, buttercup. The joke is that yo mama is so fat that when she says the world revolves around her, it's not just an ego thing. It's because her gravitational pull is so strong, she's basically a planet herself. You probably don't know what gravity is since you eat glue.