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1.
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."
by Cobrabb July 12, 2010
 
2.
to delete sth written from a list, record, etc by ticking it, crossing it over, drawing a line through it, etc.
- Her name got X'ed out from the list.
- If you behave yourself, she'll probably X out your name from report.
- Guess what! You just got X'ed from the director's record.
by André Bretas September 30, 2006
 
3.
removed from a list, forum, etc. (probably from the act of placing and x next to or on something on a list to indicate that it has been removed or has been done)
I,m in line to x out that fuck from the server.
by Light Joker April 29, 2007