Yo mama is so fat that when she is about to put her foot on the scale, the scale begs for mercy.
Scale Begs for Mercy
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Explanation
Explain Bear
Alright, listen up, buttercup. This "yo mama" joke is all about exaggerating how overweight someone's mother is. The joke implies yo mama is so massive that a weighing scale, a machine, pleads for mercy rather than attempt to measure her weight. You are probably familiar with scales, right?