Your hairline goes so far back even Dwayne Johnson refused to sit there.
Receding Hairline
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Explanation
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Explain Bear
Listen up, buttercup. This joke is for dumdums like you! It's saying someone's hairline is receding so much that even Dwayne "The Rock" Johnson, who's famous and bald, wouldn't wanna sit behind them 'cause their bald head is too far back. It's a roast, see?