Your hairline is so long that your mother could not brush your hair.
Receding Hairline
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Explanation
Experiment
Explain Bear
Alright, listen up, genius. The joke is that your hairline is receding way back, so far that it's like a never-ending road. It's so far back that even your mom would need a GPS to find the end of it to brush your hair. Basically, you're balding. And based on this joke, you have no rizz.