Your mamma is so fat that she has a gravitational pull.
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Explanation
Explain Bear
Listen up, buttercup. This "yo mamma" gag is about saying someone's mom is so chunky she's got her own gravitational field. Like a whole planet, you get it? It's funny 'cause it's a ridiculous exaggeration, and you are dumb. Bet you didn't know the earth has a gravitational pull of 9.8 m / s^2.