zonking

/Z AO1 NG K IH0 NG/
verb
  1. 1

    To hit hard .

  2. 2

    To make (someone) sleepy or delirious, to put into a stupor .

  3. 3

    (usually followed by โ€œoutโ€) To become exhausted, sleepy or delirious.

    โ€œAfter two hours of studying, I zonked out.โ€

adjective
  1. 1

    Striking; great.

Source: https://en.wiktionary.org/wiki/zonk, https://en.wiktionary.org/wiki/zonking