whap

A blow; a hit; a whop.

A breast.

To strike hard and suddenly.

To throw oneself quickly, or by an abrupt motion; to turn suddenly.

1844, Thomas Chandler Haliburton, Judge Haliburton’s Yankee Stories, Part Two, Chapter 22, Philadelphia: Lindsay & Blakiston, pp. 179-180, 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 […]

TO WHAP OVER. To turn over. (New England.)

The sound of sudden blow or hit.

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.