Yo, hairline go so far back that your dad found it before you did.
Receding Hairline
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Explanation
Explain Bear
Alright, listen up, you dummy. This "joke" is saying your hairline is receding faster than your grandpa's teeth. It's so far back, your own dad discovered it before you even noticed it was gone. You're balding, pal. Get it now, slowpoke?