F**king Brain Stealing C*nt
The name given to someone who has the exact same idea as you, but says it one second before you do. Most often used in chat rooms or group instant messaging sessions.
Person 1: "What's with the football talk? The world's going mad!"
Person 2: "Going mad? Where've you been?"
Person 3 (half a second later): "Going mad? Where've you been?"
Person 3: "FBSC!!!!"