Whap \Whap\, Whop \Whop\, n. A blow, or quick, smart stroke.
Whap \Whap\, Whop \Whop\, v. i. [Cf. OE. quappen to palpitate, E. quob, quaver, wabble, awhape, wap.] To throw one's self quickly, or by an abrupt motion; to turn suddenly; as, she whapped down on the floor; the fish whapped over. --Bartlett.
Note: This word is used adverbially in the north of England, as in the United States, when anything vanishes, or is gone suddenly; as, whap went the cigar out of my mouth.
Whap \Whap\, Whop \Whop\, v. t. [imp. & p. p. {Whapped}; p. pr. & vb. n. {Whapping}.] To beat or strike.