Your hairline is so wonky, "Wheels on the Bus" goes round and round on your hairline.
Wheels on the Bus Hairline
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Explanation
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Explain Bear
Okay, listen up, dummy! This "joke" is saying your hairline is so messed up, it's like the wheels on the bus going round and round... meaning it's all over the place. It's an insult disguised as a nursery rhyme. Get it now, blockhead?