Someone who has a changing personality, depending on who is around them. Usually one of the "cool kids" at school. Worst kind of person
1) In the morning Josh (a member of the "cool kids") has a normal conversation with Peter. Later on during the day, Peter says hello to him while he is with all his friends and Josh responds with "Shut up faggot, don't talk to me gimp". Peter thinks to him self: "WHAT A SCENEFORMER!"
2) Guy see's a girl who is about to walk past them, as she passes Guy proceeds to start pretending to box his friend.