Yo mama's so heavy and fat, gravity could not hold her down.
Gravity Defying Yo Mama
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Explanation
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Explain Bear
Listen up, buttercup. The joke is sayin' yo mama so dang heavy that gravity, which is supposed to keep us all stuck to the ground, can't even do its job. It's like tryin' to hold down a boulder with a piece of string. And knowing you, you probably think gravity is just a suggestion, huh?