Your hairline and your forehead must have a lot in common because they go waaaaaaaayyy back!
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Explanation
Explain Bear
Listen up, buttercup. This joke is saying your hairline is so far back on your head, it's practically on your neck! It's like your forehead is so big, it stretches all the way back to where your hair used to be. Ouch, that's gotta sting, genius.