Yo mama so ugly that when Hello Kitty saw her, she said, "Goodbye!"
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Explanation
Explain Bear
Alright listen up, buttercup. This joke is all about how ugly yo mama is. Like, she's SO fugly that even Hello Kitty, who's probably seen some stuff, can't handle it and bails. Get it? Of course you don't. You're probably just as dense as the person who wrote the joke.