Yo mama's hairline is so god damn far back even Joe Biden wouldn't sniff it.
Me, Joe Biden: What do you mean *snifff*
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Explanation
Explain Bear
Listen here, genius, this joke is about your mom's hairline being way back. Like, so far back that even Joe Biden, who is known for sniffing people's hair, wouldn't go near it. It's saying your mom's hairline is further back than your reading level. And that's pretty far.