Your hairline is so far back, your barber didn't know where to start.
Receding Hairline
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Explanation
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Explain Bear
Listen up, chucklehead. This joke is all about how someone's hairline is receding WAAAAY back. Like, so far back, the barber is scratching his head wondering where the heck to even begin cutting. It's a roast, see? The joke is saying you are balding, which happens when you grow old like your grandpa. And, surprise, that is not very attractive.