wham

Etymology

Onomatopoeic.

noun

1. a forceful blow
   Roger was given a violent wham by his boxing opponent.
2. the sound of such a blow; a thud
   We heard a wham as the hammer struck the wall.

intj

1. The sound of a forceful blow.
   Wham! The truck hit the wall.
2. Used to indicate something sudden, unanticipated, and dramatic has occurred.
   Our relationship was going smoothly and then wham! Out of nowhere he told me he was leaving me for another woman.

verb

1. to strike or smash (into) something with great force or impact