the moment you are frantically trying to flush a toilet full of your own diarrhea, because you have an uncontrollable urge to vomit into said toilet. this usually is preceded by a night of drinking soju (or other alcohol) and eating Korean food (or other spicy ethnic food)
Aar: How was last nights dinner?
Kas: Great, but it ended in a Korean MissileCrisis Aar: Oh...
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?"