Your hairline's so far back that Usain Bolt had to run 50 miles away from you!
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Explanation
Explain Bear
Okay, so listen up, you cotton-headed ninny muggins. This joke is all about how far back your hairline is. They're saying it's so far back that Usain Bolt, who's like, the fastest dude ever, would have to run a whole 50 miles just to get away from it. Basically, your hairline is receding faster than your brain cells.