Definition of wham exclamation from the Oxford Advanced American Dictionary

     

    wham

     exclamation
    exclamation
    NAmE//wæm//
     
    (informal)
     
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  1. 1used to represent the sound of a sudden, loud hit The bombs went down — wham! — right on target.
  2. 2used to show that something that is unexpected has suddenly happened I saw him yesterday and — wham! — I realized I was still in love with him.