To delete a pop-up window on your computer.
No, I do not want a ''free'' Labtop, X off Dammit!
by Jerry the moose February 21, 2008
1 more definition
To turn off a tab on the computer. (The x icon removes a programme)
Don't x off my programme I'm just going to the bathroom.
by Malffy Hernandes August 18, 2007