I hate Jill, and when I saw her delighted that John asked her out, I came up with a devious plan to unhappienate her - I killed John. With a butcher's knife. In the ass. I bet it hurt.
I think by smashing my train to pieces, I may have unhappienated it a little.
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?"