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Life saver, Used in computer classes to close windows to save you from being caught doing you aren't supposed to
Guy 1: "Psst! the teacher's coming this way!"
Guy 2: "Alt+F4 Alt+F4!!!!!!
by ThePhasePhantom November 22, 2012
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The mean way to make a newbie quit on windows computers
Newbie: how do i ____?
Dick: Alt+F4
Newbie *quits and is discouraged to play and leaves which slowly makes the community only pros making new people steer away and eventually killing the game as a marketable object*
by Sleepy_Nerd June 12, 2015
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An unoriginal old prank that nobody falls for anymore, (except the 10 years olds)
10 Year old has joined the game.
10 Year old: Hey how do you run fast?
xxmLGpro69x: Press and hold ALT + F4
10 Year old has left the game.
by this is really long name February 05, 2016
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Most useful keyboard shortcut of your computer, has many features depending on the program you use or site you're in:

Urban Dictionary - Auto-like all definitions in your current page
Pornhub - Slow motion mode
CS:GO - Free golden karambit.
Facebook - Find hottest chicks in your city
Fox News - Automatic DDOS attack
Youtube - Find all "removed" videos, including but not limited to: anal midget porn, ISIS decapitation videos, George W. Bush confession of carrying out 9/11 and sexual intercourse between Kim Kardashian and a Hippopotamus
FBI: We can't find "deleted" Hillary Clinton emails!
Journalist: Hell you can, Alt+F4 !
by 32121 July 28, 2016
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1. These keys will exit a program instead of using the exit icons.
2. A fun way to get rid of noobs in multiplayer games and chat rooms.
Halo guy 1: "Hey how do you change grenades?"
Halo guy 2: "ALt+F4."
Halo guy 1: diconnected
Halo guy 2: "HAHA stupid noob!"
Halo guy 1: re-enter: "Hey that's not funny dickhead!"
Halo guy 2: "STFU stupid Noob!"
by Punkhead May 25, 2005
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