an expressionless and judgmental look given to someone who has just made an unfunny, ignorant, or asinine joke, statement, or action. designed to express disapproval in a way that makes it clear that the receivers previous offering was not even deserving of a reaction of any kind.
joe: i think we should get tacos
will: your FACE is a taco! lol
joe: :| *note: that's what a dumb face looks like*
will: get it? because... like.. you eat tacos... with... your face?
joe: ... anyway, i think we should get tacos