Combination of yacking and nagging. When your girlfriend/wife is killing you verbally for hours and won't shut up or let you sleep because of something you did.
Man, my wife has been yagging me all day and night for forgetting our anniversary. I didn't get any sleep last night.
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.