Yo mama's so fat, a man has to bring climbing equipment to kiss her on the cheek.
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Explanation
Explain Bear
Okay, listen up, genius. This "yo mama" joke is all about exaggerating how fat someone's mama is. Like, she's so big, a dude needs climbing gear just to plant a smooch on her cheek. It's funny because it's so over-the-top, and probably because you're not very bright.