bam
exclamation /bæm/
  /bæm/
(informal)- used to represent the sound of a sudden loud hit or a gun being fired
- She pointed the gun at him and—bam!
 
 - used to show that something happens very suddenly
- I saw him yesterday and—bam!—I realized I was still in love with him.
 
 
Word Origin1920s: imitative.