The rattling of a loose part from within a video game controller typically due to throwing ones own controller at the floor because of a rage out caused by a game that is difficult to beat or an online gamer that is too good to pwn.
Friend 1: Dude, you through your controller at the floor huh?
Friend 2: How do you know?
Friend 1: Because you can hear the rage rattle inside (Shakes Controller)
Friend 2: Yeah, I raged out last week when I was playing Modern Warfare 3 online.