The act of pushing the Fn key on a keyboard with one hand, then running your other hand across the row with the function keys (F1, F2...). Whatever options are bound to those keys will all be triggered at once. This works best on laptops, as the function keys do things like lock the computer, change screen size, and alter wireless configuration. This often causes destruction to the user's computer, for hilarious effect.
Person 1: What's on your computer?
*leans in, fn-slides, flees*
Person 2: What the fuck! What did you do?
*computer attempts to resize the screen, turn on num lock, hibernate, lock workstation, and change contrast*