Your mother's hairline is sooooooo long cause Dora the Explorer could not explore it.
Dora Can't Explore This Hairline
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Explanation
Explain Bear
Listen up, buttercup. This joke is saying the dude's mom has a HUGE forehead, so big that even Dora the Explorer couldn't explore all of it. And you know Dora explores everything, even your tiny brain capacity, probably.