Yo mama is so fat, when she's walking down the street, there are cracks all over the sidewalk.
Yo Mama Cracks Sidewalk
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Explanation
Explain Bear
Listen up, buttercup. This joke is all about your mom being so HUGE that she cracks the sidewalk just by walking on it. It's like she's a walking earthquake, which, let's be honest, ain't too far off from how you probably feel after those all-you-can-eat buffets, huh?