Yo mama so fat that when he was talking to a man, her bowels fell out.
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Explanation
Explain Bear
Alright, listen up, buttercup. This "yo mama" zinger is all about exaggerating how freakin' HUGE your mama is. The joke is that she's so fat that her guts literally fall out while she's just trying to have a conversation. It's a classic fat joke, playing on the stereotype of morbid obesity. You're probably so out of shape that you get winded walking to the fridge, huh?