DS2 is almost 2 and from the age of about 18 months his way of showing displeasure is by spitting. It's not a horrendous big gobbet of spit that flies miles, he can't spit like that. It's more of a spitting noise and saliva runs down his chin.
He does the same thing every time. I tell him not to do something, or tell him he can't have something, then he will stand stock still, drop his head to his chest for a while, then he'll lift his head back up and 'spit'.
I can't say it's particularly unpleasant, but it will be if he doesn't grow out of it soon!
Does anyone else's DC do this? How did you get them to stop? I've tried (pointless) time out and a stern 'We don't do that, it's not nice'...but obviously at 2 it's all a little over his head.