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F4 is the key in between F3 and F5.
(Another definition)
F4 is fuck. people say F4 to bypass Roblox's Tags or etc.
Guy 1: Do you like grapefruits?
Guy 2: F4 no!
In Natural-Selection (HL-modification) the F4 key when pressed, takes you out of the game and into the ReadyRoom, where you can choose to join a team or just jump about. When one team is getting completely wiped out, Some players may call out for the others to "F4!" as a way to end the game early, and sometimes, to deny the opposing team a victory.
they Have Skulks! F4! F4!
meaning fuck, commonly used in roblox.
awh f4, i forgot to tell you smt.
It is used on roblox as to say "the fuck" and is mostly used on gacha online.
*see something weird*
Person: F4 was that?!
a button on the keyboard in between F3 and F5. when button is pressed at the same time with the "alt" key windows on the screen go away really fast.
A: dude press alt-F4 to get tons of cash.
B: oh awesome thanks.
~B has quit the game~
A: sucker