Yo mama was so fat, the Earth was flat before they put your mama in a grave.
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Explanation
Explain Bear
Listen up, buttercup. This "yo mama" joke is saying the person's mom is so obese that her weight flattened the Earth. And it was only after she died and was buried that the Earth returned to its normal round shape. Get it? Cause she's fat! Earth isn't flat and your mom is probably a nice lady. You're still dumb though.