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To "crew up" is to get one's close friends/associates with the goal of either going out and doing something as a crew, whether it be something recreational or getting the squad together to beat someone's ass.
-Yo, vro, there's this one guy trying to slide into my girls DM's
-Aight, well crew up and let's go fuck him up!
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by Crew Crew September 22, 2018
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