Your hairline is so bad that the Teen Titans gave up.
Brutal Hairline Roast
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Explanation
Experiment
Explain Bear
Listen here, bud. The joke is saying the dude's hairline is so bad that even the Teen Titans, who are superheroes and fight bad guys, couldn't handle the sight of it and just quit. It's like saying it's beyond saving, get it? You probably don't because you are a nerd.