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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!!!!!!
ALT+F4 by ThePhasePhantom November 27, 2012
The biggest life changing function in Windows. Used to close Chrome in Computer Science classes. It is also used in online classes to mute the volume of teacher. Thanks Microsoft for this stuff
My teacher asked me to volume down and I told him to press Alt+F4. I escaped from an online class
Alt+F4 by DankWarrior703 March 21, 2020
The (not so) secret key combo that every teen must know. Pressing Alt+F4 on an active window closes that window instantly, which is useful especially if you're on something you're not supposed to be on. It works on Windows and Linux, however on Mac, you must instead press command + Q, and if you use a Chromebook, the closest you will get to alt+f4 is Ctrl + Shift + Q, which logs you out if pressed two times.
Seriously, Alt+f4 can be a life saver, especially at class or if you have overprotective/strict parents that makes your house look like North Korea
Alt+F4 by GyattDayum23 April 1, 2020
The generic way of remedying an otherwise impossible situation.
ALT+F4 by Dongasaurus May 27, 2006
ASCII Code for blank space. A non- represented character by the keyboard.
I needed extra security so I added alt+255 to my password.
Alt+255 by Ochita August 26, 2016

Alt+Space+C 

The big brain method to get a noob to quit.

Alt+Space opens the right click menu on the top, C is the shortcut to close it when the menu is open.
Noob has joined the game

Noob: How do I _____?
Someone: Alt+Space+C

Noob has left the game
Alt+Space+C by Phexonilow May 21, 2020