Whop (verb)

1. To strike or hit with a sudden, sharp sound.
2. To make a sudden, sharp sound when striking or hitting something.

Origin:

From the onomatopoeia "whop" meaning a sudden sharp sound.

Examples:

1. He whopped the ball with his racket.
2. She whopped him on the head with a book.
3. The door whopped shut.
4. The tree whopped against the window in the wind.
5. He whopped the table with his hand to get attention.