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Adjective: slam-bang  'slam'bang
  1. Violent and sudden and noisy
    "a slam-bang collision"
Adverb: slam-bang  'slam'bang
  1. In a careless or reckless manner
    "the shelves were put up slam-bang";
    - slapdash
  2. With heedless speed
  3. In a violent, sudden or noisy manner
    "the pans fell slam-bang and woke the whole house";
    - slap-bang

See also: violent