Yo mama so fat that when God said, "Let there be light," he asked her to move out the way.
Yo Mama Blocks the Light
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Explanation
Explain Bear
Listen up, buttercup. This joke is all about exaggerating how overweight "yo mama" is. The joke implies she's so massive that she can block out light, even from God! It's like saying she's bigger than the sun, which is obviously not true. Get it now, dummy?