AKA the Bird or middle finger. Derived from a feminist request to refrain from clapping and use jazz hands to show appreciation at a conference to as to not 'trigger' attendees by clapping.
SJWs want us to use Jazz hands instead of applause, let me show them my Jazz Finger.
Klaxons Slang (Anglo-Klaxon) This is when people are guitar-wanking (showing off a song.) Although it doesn't have to music-related - just something over the top and unnecessary.
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?"