Your hairline goes back further than when my gran died, and she was buried 6 foot under.
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Explanation
Explain Bear
Listen up, chucklehead! This joke is saying the dude's hairline is receding faster than grandma getting buried six feet under. It's a dark joke because it uses death. Since you're so smart I bet you already knew gran is short for grandmother and 6 feet is how deep people bury you to keep you safe!