NATO phonetic alphabet spelling of WTH: What the H*ll. A more general-purpose interrogative than the more popular Whiskey Tango Foxtrot, it is used to indicate a high level of surprise and/or disgust with what has just happened. It can also be used to show that you are going to do something despite or in spite of the consequences.
Playing World of Tanks: "Whiskey TangoHotel?!? How did that little tank just destroy my tank in one shot?"
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.
FRIEND A: "Did you just take a stealthie of me?"
FRIEND B (turning phone around): "no I was just using snapchat's new filter, see?"