Definition of "whap"

whap¹

noun
plural whaps
1. A blow; a hit; a whop.
verb
third-person singular simple present whaps, present participle whapping, simple past and past participle whapped
1. (US, transitive) To strike hard and suddenly.
2. (US, intransitive) To throw oneself quickly, or by an abrupt motion; to turn suddenly.
  Quotations
  He wears his hat a little a one side, rakish-like, whaps his cane down ag’in the pavement hard, as if he intended to keep things in their place, swaggers a few, as if he though he had a right to look big […]
  1844, Thomas Chandler Haliburton, Judge Haliburton’s Yankee Stories, Part Two, Chapter 22, Philadelphia: Lindsay & Blakiston, pp. 179-180
  TO WHAP OVER. To turn over. (New England.)
  1848, John Russell Bartlett, Dictionary of Americanisms‎, New York: Bartlett & Welford, page 379
  And at last, as they wrestled and whapped together, they fell headlong in the stream.
  1902, Henry Van Dyke, “The Mill”, in The Blue Flower‎, New York: Scribner, page 65
  Screen doors whapped throughout the night […]
  1989, John Irving, chapter 9, in A Prayer for Owen Meany‎, New York: William Morrow, page 524
interjection
1. The sound of sudden blow or hit.
  Quotations
  Whap, Biff, Ooooof, Sock, Pow, Zok! Batman is back. Gotham City is again leaving its law and order in the hands of a man who wears plastic underpants over his tights.
  1989 June 5, The Canberra Times, Australia Capital Territory, page 10, column 2

noun
plural whaps
1. (Scotland, obsolete) The curlew, Numenius arquata; a whaup.