wham

Short definition from Wiktionary

Noun

1. 1
   A forceful blow.
2. 2
   The sound of such a blow; a thud.
3. 3
   An attempt.
4. 4
   A great success.

Interjection

1. 1
   Used to indicate the sound of a forceful blow, an explosion, etc.
2. 2
   Used to indicate something dramatic, sudden, and unanticipated has occurred.

Verb

1. 1
   To smash or strike (someone or something) with great force or impact; to slam, to whack.
2. 2
   To propel (something) with great force by kicking, striking, throwing, etc.
3. 3
   To smash or strike with great force or impact.
4. 4
   To move quickly or loudly.