(pronounced as an alveolar click; spelling pron. tisk),
1. (used, often in quick repetition, as an exclamation of contempt, disdain, impatience, etc.)
2. for shame!
an exclamation of “tsk.”
to utter the exclamation “tsk.” Also,tsk'tsk'.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.