Yo mama's so nasty, they used to call them jumpolines 'til yo mama bounced on one.
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Explanation
Explain Bear
Listen up, chucklehead! This "yo mama" gag is all about exaggerating how gross your mama is. She's so repulsive that trampolines were renamed "jumpolines" after she bounced on one. Basically, your mama is so nasty that she changes the English language.