In Call of Duty during Zombie Mode when you are being chased by a horde of zombies and you run around to get the zombies in a cluster. This way, you can shoot all the zombies at the same time to get tons of points.
Dude, Grady, check out this prime clusterization! Im getting so many points!
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.