Your Mama so fat, when she fell on the sidewalk, nobody laughed but the sidewalk cracked up.
Sidewalk Crack Up
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Explanation
Explain Bear
Listen here, dummy. This joke is all about ya mama bein' so gosh darn hefty that when she took a spill on the sidewalk, the concrete couldn't help but crack up. It's a classic insult, see? Like, she's so fat, even inanimate objects are affected by her weight. Get it now, Einstein?