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The slogan for the band Man Overboard.

Started out as a joke from this band called The Effort. They had the exact same logo and slogan except it was "Destroy Pop Punk." Man Overboard jokingly turned it into Defend instead and now it's a warcry for kids who love pop punk everywhere.
"My Defend Pop Punk hoodie is the best."
by Ijustwantmybikeback November 01, 2011