Your hairline has a huge path between it, looks like Moses had something to do with it.
Moses Hairline
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Explanation
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Explain Bear
Okay, so listen up, smarty-pants. The joke is that the person's hairline is so far back that it looks like Moses parted the Red Sea on their head. Moses is a biblical figure known for parting the Red Sea, right? So, basically, this joke is saying your hairline is receding into oblivion.