1) only the coolest word a person can say.
2) used almost like the word "psh" but more expressive and a bettwe comeback if used during combat.
3)a term to describe a amount of stress - like a *sigh*.
him: but..but i thought california was going to break off and chill with alaska!!
her: oh sheeshkabob billy, you can be so silly sometimes
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.