a towny, some one who takes pleasure on terrorising and making life hell for anyone who is not part of their gangs. they all deserve cancer, or some other long term illness that will eventually kill them
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.