Very, very angry, and probably about to strangle you. It refers to Star Trek's character Mr. Spock, who can be a very pissed off alien if somebody dares mention his human mother, and therefore provokes an emotional reaction in him. It is not, under any circumstances, an advisable move.
First used by Brittany Diamond in her Star Trek TOS commentary.
If someone has to ask about Landrew one more FREAKIN’ time and NOT get an answer, I swear I will go CRAZY like a SPOCK who’s just had his MOTHER insulted.
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?"