gangbusters

noun
  1. 1

    A law enforcement officer who specializes in disrupting organized crime.

Synonyms

adjective
  1. 1

    Very successful or profitable

adverb
  1. 1

    With great energy or speed; very well. (Frequently with go.)

Source: https://en.wiktionary.org/wiki/gangbuster, https://en.wiktionary.org/wiki/gangbusters