v. dial. [Echoic; expressing a sound that begins like a twang, but is abruptly cut short, such as is produced by striking a body with small resonance.] a. intr. To twang with short and sharp effect. b. trans. To strike with the open palm, to spank. Hence Twanking vbl. sb. and ppl. a.; also Twanker = TWANGER b.

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1711.  Addison, Spect., No. 251, ¶ 4. Disturbing a whole Street for an Hour together, with the Twanking of a Brass-Kettle or a Frying-Pan.

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1821.  Clare, Vill. Minstr., I. 90. While distant thresher’s swingle drops With sharp and hollow-twanking raps.

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a. 1825.  Forby, Voc. E. Anglia, Twank, v. … 2. To give a smart slap with the flat of the hand, on the breech, or other fleshy part.

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1828.  Craven Gloss., Twanker, a large bulky person; any thing large.

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1905.  Daily Chron., 16 June, 6/5. When she tried to escape Mrs. Lewthwaite gave her a ‘twanking.’

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