Yo momma's so old that even scientists get baffled about where she lived before Earth was created.
Yo Momma's Age
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Explain Bear
Listen up, buttercup. This joke is saying yo momma is super old, like older than dirt. So old that scientists are scratching their heads trying to figure out where she could've even existed before Earth was a thing. You know, because Earth is pretty old, and your momma is supposedly older. Get it now, dummy?