slow blinking
When you are talking to someone and the only thing coming out of their mouth is complete utter bullshit and you find yourself so lost for words at their stupidity that all you can do is slowblink at them

Slowblink* blinking in slow-motion to show how uninterested you are
Sally: last night at the club all these boys were staring at me,I think they all fancy me

Charlie: *slow blinking*