A brief period of time where one "loses time" or feels as if their consciousness stepped away and left the body on auto-pilot. Most frequently accompanied with mild paranoia.
Jack: Where'd you go dude?
Caleb: What do you mean? I was sitting on the balcony smoking for a couple minutes.
Jack: You were gone for over an hour. I think you White Lined.
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?"