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When your eyebrows become more bushy than is socially acceptable. Derived from the large eyebrows of Noel and Liam Gallagher
Guy 1: Dude, your brows are fucking massive man, you've totally got Gallagher Brows
Guy 2: Totally don't
Guy 3: Dude, you've totally got Gallagher Brows
by Blargle Margle December 17, 2011
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