The noise used when imitating the
sound of a whip
cracking. most commonly heard when someone is getting told off, or have just
got owned.
It is pronouced by using a hard 'k', and saying the 'tsh' like 'tush' but squashed together.
Teacher: You are not here to point out grammatical mistakes on my
board. I haven't spent all my
time and effort doing these pages for you, for you to concentrate on the wrong
thing. Out of my classroom!
Everyone else present: k'tsh! k'tsh!