Yo Mamma's so fat that she falls from both sides of the bed.
Yo Mamma Falls Off the Bed
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Explanation
Explain Bear
Alright, listen up, buttercup. This "Yo Mamma" joke is all about exaggerating how overweight someone's mother is. The punchline is that she's so fat, she can't even stay on the bed. You probably haven't seen a bed in a while, so let me "splain" it to ya: beds are for sleeping, which is something you probably do a lot of.