a. To drink so heavily that all bodily functions are rendered useless. Loss of memory and bladder control is usually a bi-product.
b. To be completely and totally fucked up
Bob went out last night and got so fashnickered that he woke up with Paul instead of Paula.
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?"