A lightly usedinsult referring to someone who is being a noob and you are calling them a scrub.
Person 1: "Hey guys! In Super Smash Bros, throw off the ledge to down smash spike is a true combo!"
Person 2: "Your such a nubscrub. That's impossible."
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.