1.) smells like tuna thats been baking in the hot sun all afternoon. 2.)a fish sandwich that was left in your car over the weekend and that smell that first hits your noise when you open door
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.