Yo mama so fat, she has to bathe in the Pacific Ocean.
Yo Mama Bathes in the Pacific
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Explanation
Explain Bear
Alright, listen up, buttercup. This "yo mama" joke is saying your mom is so obese that she needs the entire Pacific Ocean to take a bath. Pacific Ocean is quite large, and you needing that much space to take a bath would mean you are VERY obese.