Dictionary

gangbuster

noun gang·bust·er \ˈgaŋ-ˌbəs-tər\

Definition of GANGBUSTER

:  one engaged in the aggressive breakup of organized criminal gangs
like gangbusters
:  with great or excessive force or aggressiveness <came on like gangbusters>; also :  with great speed or success <was selling like gangbusters>

First Known Use of GANGBUSTER

1940

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