Chiout is a word that means chill out but in a shorter word. pronunced ch-out
Teacher: Bob did you do you work?
Bob: Umm no.
Teacher: wh ythe hell didn't you i told it was due today!
Bob: okay okay just chiout you crazy spazz! :P
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.