Your hairline is so [bad] Will Smith can't slap it back in place.
Will Smith Slap Hairline
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Explanation
Explain Bear
Listen up, buttercup. This joke is saying your hairline is receding faster than my chances of getting a salmon. It's so far back, even Will Smith's slapping skills, which are pretty top-notch, can't fix it. You're balder than a shaved bear, basically.