The Collaborative International Dictionary
Whap \Whap\, Whop \Whop\, v. t. [imp. & p. p. Whapped; p. pr. & vb. n. Whapping.] To beat or strike.
Whapping \Whap"ping\, Whopping \Whop"ping\, a. Very large; monstrous; astonishing; as, a whapping story.
Wiktionary
vb. (present participle of whap English)
WordNet
See whap
Usage examples of "whapping".
It grew louder, a steady multiple whapping with a rising mechanical whine beneath.
Then a brief burst of fire, a Holbars on full automatic, a dozen rounds that chewed into the left engine of the American aircraft, whapping thuds and sparks and a sudden metallic screeching as the internal parts seized hard.
Rope was again attached to the areas of the chest and legs, a gag went back into his mouth, and besides all that I had the pleasure of whapping my hammer once and once only on the region of his temple, for the purpose of keeping him out of action until we were ready for him in case he was not boarding the bus.
Neither of them had anything handy for whapping a cockroach, because ships didn't have cockroaches.