"Kreilinger Yoghurt Sex" is a term, used to invite another person to the act of putting 5 ounces of Yoghurt onto each others neck, licking it off clean and yelling "I mog!", the Austrian term for "I want to!"
When an odd number of people join hands and circle around a person or group of people and dance around them, humming the tune of "Pop goes the Weasel". Then the Kreggers jump in the center and smash the Victim. It's usually done to annoy some, and is best done when the Victim, known as the Kreg, is having an important conversation or is trying to do something difficult. Results are EPIC.
Person 1: "Dude, see that kid? Remember when he egg'd my house last year?"
Person 2: "Yeah dude, let's Kreg that bitch."
Person 3: "Hell yeah!"
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.