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Meaning of gangbuster

gang•bust•er

Pronunciation: (gang'bus"tur), [key]
— n. Informal.
  1. a law-enforcement officer who specializes in breaking up organized crime, often by forceful or sensational means.
  2. someone or something having great impact, usually in a positive way.
  3. an outstandingly successful state or situation: We aren't looking for gangbusters, but we'd like you to pass all your subjects this semester.
  4. with great speed, intensity, vigor, impact, or success: The software market was growing like gangbusters. The hockey team came on at the beginning of the season like gangbusters.
—adj.
—adv.
  1. to be extremely successful: The movie went gangbusters.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.