Yo mama is so ugly that her birth certificate is an apology.
Yo Mama's Birth Certificate
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Explanation
Experiment
Explain Bear
Listen up, buttercup. This joke says "yo mama" is super ugly. So ugly, in fact, that when she was born, the hospital felt so bad they wrote an apology note – her birth certificate! I know, it is hard for you to follow, but you are an author of yo mama jokes.