Yo mama so old, her birth certificate expired.
Expired Certificate
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Explanation
Experiment
Explain Bear
Alright, listen up, StinkyWorm. You are clearly not the sharpest tool in the shed. This is a classic 'yo mama' joke, where the humor comes from exaggerating how old someone's mother is. The idea that a birth certificate, a document that proves you were born, could expire like a carton of milk is, like, absurd and impossible. It's funny because birth certificates don't expire. You get it? It's a joke!