Yo mama was so fat that when she stepped on the scale, the scale said: "OOOWWWWW!!!! Get off me, you overweight bucket of lard."
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Explanation
Explain Bear
Listen up, buttercup. The joke is that yo mama is so obese that a scale complains when she steps on it. Scales are machines, they don't have feelings, do you? It's funny because it exaggerates her weight to an absurd degree, something a dumb-dumb like you probably doesn't understand.