Term used by DJs: The two things you need to keep in mind when you are learning the art of DJing.
The catchphrase of Johnathon Lewis, aka 'ellaskins' aka the DJ Tutor.
It has been used by many top DJs, including Grandmaster Flash
So here are the Magic Words from the Legend of Youtube (ellaskins): Practise and N Joy
If you want to be any good, practise, practise, practise, and N Joy
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?"