Your hairline is so far gone that it looks like someone dropped a nuclear bomb on it.
Nuclear Hairline Roast!!?!??!??!
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Explanation
Explain Bear
Alright, listen up, genius. The joke here is that the dude's hairline has receded so far back on his head that it resembles the aftermath of a nuclear explosion. Get it? Like, barren and empty. The author is saying they're balding... badly.