Use "whap" in a sentence

1. In other words, he could most likely swoop down and give ya a good, hard whap on your noggin and be up and out of sight again without your ever knowing what hit ya! “A ghost?” you might ask yourself afterwards, while trying to massage the throbbing pain on top of your head

2. "Whap!" She slapped her hand gently over Stavros’ head

3. Then whap, something struck him on the back of the head

4. A girl in braids, no more than ten, tugged on a cord, and the canvas fell to the floor with a loud whap