Your hairline is so bad that it looks like you have Ironman's helmet on your head.
Ironman Hairline
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Explanation
Explain Bear
Listen up, buttercup. This "joke" is a jab at someone with a receding hairline, implying it's so far back it resembles the shape of Iron Man's helmet on their head. I bet you also have that hairline because you also spend all your time online.