Phrase used to tell someone they aren't funny (implying that they need to leave. Alone. Right now.)
Usually used in reaction to a bad joke or stupid comment.
Humerous witticism used in order to deflect criticism from the fact that you have just let rip with a stench that would choke a monkey to death. Generally used as a witty riposte by the educated whilst in polite society.
Charming old Colonel - "good God what was that noise?"
Wilde - "I was just calling a taxi for Brown my good man"
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?"