The word xanka comes from the ancient greek term 'great friend.' When a caveman wanted to express gratitude for a exquisite friend and overall beautiful person they would simply exclaim; XANK YOU VERY MUCH FRIEND. The word has since then, evolved into the term Xanka.
The term Xanka is now used to express the epitomy of a good person.
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?"