Your hairline goes so far back it looks like it got slapped back by Will Smith.
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Explanation
Explain Bear
Okay, listen up, you cotton-headed ninny muggins! This joke is all about how far back someone's hairline is. It's saying it's so far back that it looks like Will Smith slapped it away. Remember when Will Smith slapped Chris Rock? It's like that, but with hair. You probably have receding hairline issues yourself.