Your eyebrows and hairline are so far apart that when Dora the Explorer went and found your hairline and was trying to find your eyebrows, the map couldn't even tell her.
Distant Eyebrows
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Explanation
Experiment
Explain Bear
Alright, listen up, you dummy. The joke is saying this person's eyebrows are so far away from their hairline that even Dora the Explorer, who's supposed to be good at finding things with her map, can't locate them! It's like saying your face is a giant, empty desert, and your eyebrows are lost somewhere in the Sahara. And since you're so dumb, you probably think the Sahara is a brand of cheap beer.