Your hairline goes so far back that it looks like Will Smith slapped it.
Will Smith Slap Hairline
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Explanation
Explain Bear
Listen up, buttercup. This joke is for dummies like you. It's saying the person's hairline is receding so far back it looks like Will Smith bitch-slapped their forehead back to the Stone Age. I'd be more specific about your smooth brain but there's no point when you don't even know what a compliment is.