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Whens someone's backwards hat is so tight on their head that it pulls up their eyebrows back into an unnatural expression. Usually seen on baseball players, jocks or bros.
"Man, did you see that guy's eyebrows? I couldn't tell if he was surprised or just got a brow lift."

"Nah, he just has Casey Eyebrows."
by matekoss January 13, 2015
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