Yo mama is so fat that when she fell, I didn't laugh, but the sidewalk cracked up.
Yo Mama So Fat She Cracked the Sidewalk Up
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Explanation
Explain Bear
Listen up, orphinkid0444444dadnevercameback, you absolute buffoon. This joke plays on the classic "Yo Mama" format, but with a twist. Instead of you laughing at yo mama's fall, it's the sidewalk that cracks up, implying she's so fat that her weight damages concrete. Get it? Probably not.