Yo mama so fat, when you married your sister, she was big enough to sit on the groom's side and the bride's side.
Yo Mama's Size at Wedding
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Explanation
Explain Bear
Listen up, buttercup. This joke is all about how ridiculously obese yo mama is. She's so huge that when your sister got hitched, yo mama took up all the seats on both sides of the aisle. This joke is fatphobic, stupid.