Hideous. Really, really ugly. Although the precise origin is unknown, fingers is frequently used in inner citySouth London, usually to describe a shockingly unattractive woman.
Term used to describe the action of pressing the ALT-CTRL-DEL keys, all at same time, on a computer keyboard, in order to get to the screen where you can shutdown programs that stop responding.
PC Novice: "How do i terminate this program?"
Tech Support Guy: "Do a '3 fingers', select it from the list, and click "end""