A word often used in place of vagina, pussy or female. First used by the germans in the 1500's when referring to members of the more feminine sex. It has since become quite popular with males who wish to talk about and refer to females, without the females becoming aware of what the conversation is really about. Males who spend their lives looking for schninn are known as 'Schninn Hunters'.
Joel was walking down the beachfront when he noticed some fine ass schninn sunbaking on the sand.
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?"