What is tsktsktsk?

something used by dumb bitches who think they're cool

save the turtles, tsktsktsktsktsktsktsktsk, (drops hydro flask) and i -oop

tsktsktsk - meme gif

Used to hint at sonething, usage of onomatopoeia here.
Usually used online rather than said out.
When spoken, sounds like tss-tss-tss.

A: "I'm so disappointed in you. tsktsktsk."
(B is looking at some girls etc.)