thwacking

/TH W AO1 K IH0 NG/
verb
  1. 1

    To hit with a flat implement.

  2. 2

    To beat.

  3. 3

    To fill to overflow.

noun
  1. 1

    The action or sound of a thwack; a beating.

Source: https://en.wiktionary.org/wiki/thwack, https://en.wiktionary.org/wiki/thwacking