What Do You Think About That (WDYTAT) is often used in a line of questioning to gather another's opinion on the matter at hand. This short-hand acronym allows for quick questioning to gain a rapid response from the other person.
when you're holding up your phone and making faces at it, as though you are taking a selfie, but you're really taking a picture of the person across from you or the wall or anything else that seems interesting but you don't want to be caught dead taking a picture of.
This action is often made more convincing by wiggling the eyebrows or opening the mouth, to pretend you're trying to get a Snapchat filter to work.