There is a scene I have come across and one of the characters is making a sound, kind of like a tsk, tsking sound, but I'm not sure how to write this. I've avoided this in my writing, because I've never known how to depict this accurately, but it's driving me crazy. We've all heard this sound. It's made almost as a gesture of "shame on you," but the sound is made with the tongue against the teeth. Almost like a bird chirping. Can someone help? Please.