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To close a computer program. Refers to the fact that on computers, the button to close a program is represented by an x. Usually used by people who don't know much about computers to begin with.
1: "Ok, now I'm supposed to x out of internet explorer?"
2: "Yes. But get firefox, for the love of god."
X out by Cobrabb July 13, 2010
Related Words
xavier XD X X-box xander xxxtentacion Xbox 360 Xnopyt xanga xxx
An expression used in chat and message boards to mean you are exasperated with someone.
John: I am 1337!
Jake: X.X
X.X by Zach Kline February 3, 2004

X-Factor 

to stand out from all of the rest, to be the "only one" at something or not common

syn: unknown
in our lives there is at least x factor that is some what a mysterious to us.
X-Factor by mrmiamian November 10, 2003
A pretty good rock band. Sound something like old school. Surprisingly these guys can sing in pretty good english. I favorite song by them is Drain (aka What's Up Mr. Jones?)
X Japan by zEn Ma$tA May 9, 2005

X-Box 360 

One of the new next-gen consoles. This one is the one made by microsoft, and it does look pretty awesome. And although 2 of those guys before believe otherwise, you can't say it will be more awesome than the PS3 and the rev when you don't know anything about what either will be like at release.
X-Box 360 by Thomas P May 1, 2006
The hardest and utmost degree of core; the most X-treme level of core attainable.
billy: So I was fucking this girl in a jacuzzi, and I was on it so hard I hit my face on the side and broke my tooth.
me: Shit dude...so did you finish?
billy: FUCK YEAH...*walks away like a badass*
me: Damn that guy is x core.
x core by Badass.com January 8, 2007