A dirty Kerija is when you visit the US as a foreigner and no goddam person can pronounce your name correctly so you die a little bit each time someone calls you "karen" by accident and at the end of your trip you've heard an insane an of stupid mispronounciations of your name (one of which is korea) so you go back to your home country and tell everyone what wild creations people did with your name
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?"