Someone that is not attracted to anything, be it man or woman. Emos often claim to be zsexual, though are most likely lying.
Straight Friend: Hey, check out that hot chick over there!
Zsexual: I'm not interested in girls...
Gay Friend: Then what about that cute guy?
Zsexual: I don't like guys either.
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?"