n. A source of all knowledge. Usually on a particular subject (e.g "The Stargate Omnipedia, "The Star Trek Omnipedia") but can theoretically be used to describe a source of literally ALL knowledge.
It is distinguished from an enclyclopedia by not needing to be short or to the point. It can include everything on the subject matter.
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?"