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A loosely aligned group of misfits at Columbine High School in the time of the Columbine Shootings. Eric Harris and Dylan Klebold were members of the Threnchcoat Mafia. Harris and Klebold had advocated 'killing jocks' but ended up doing something wrong instead. 'Trenchcoat Mafia' now indicates any similar group of losers with a patina of simmering menace.
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