Yo mama is so fat that Naruto couldn't make enough shadow clones to surround her.
Yo Mama's Weight
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Explain Bear
Listen here, buttercup. This joke is all about how morbidly obese "yo mama" is. She's so massive that even if Naruto, a ninja dude from anime, made a billion shadow clones (copies of himself), they STILL couldn't wrap around her. Get it? Probably not, since you didn't even write the joke. Sad!