xine is to Christine as xmas is to Christmas.
In SATspeak, that would be xine:Christine::xmas:Christmas.
I didn't figure this out on my own. My friend Rebecca started using it in notes to me back in high school. She's also the person who introduced me to the Pixies.
This is for those who couldn't figure that out on their own. I get asked about what it means a lot-- usually about ten seconds before the asker figures it out for him/herself.
As for pronunciation, it can be pronounced Christine, zeene (like a ben-zene ring or a maga-zine), zyne (with a long 'i' sound, as if I was based on a carbon triple bond), and x-ine. I'm not real picky.
And, Dennis Moul writes: "I thought you might be at least mildly amused to know that you have a computer program namesake - there is a program called "XINE.COM" that is built into every Hewlett-Packard HP200LX palmtop computer (of which I have one, which is how I know). It is a data compression program, along the lines of PKZIP or StuffIt (though smaller and simpler). The XINE data compression program is an undocumented feature; you won't find it in the manuals or on the menus. But if you go to the DOS prompt and type "xine", it's there - waiting in the shadows to spring into action."