or tsk·tsk

[pronounced as an alveolar click; spelling pronunciation tisk or tisk-tisk]
  1. an exclamation of “tsk.”
verb (used without object)
  1. to utter the exclamation “tsk.”
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Word Origin and History for tsk

sound expressing commisseration or disapproval, 1947; as a verb, tsk-tsk is recorded from 1967.

Online Etymology Dictionary, © 2010 Douglas Harper