An unpleasant feeling some people infrequently experience when taking a drag of marijuana. Some report it as their brain exploding, or swelling of their heart combined with anxiety. It's only temporary and goes away after a few seconds.
Take the spliff away dude, this afterkick is killing me.
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?"