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To remove a 'friendship' from facebook due to having either accidentily adding him/her as a friend or actually adding them and reconsidering later.
"Yeah, there was this guy in my network who added me. I thought he looked ok, but his updates were really cramping my news feed, so I had to deface him."

"I went on a date with a girl I met a week before and like the day after our date she changed her status to 'in a relationship.' I defaced her."
by Zennon December 16, 2007
To ruin a picture of something, esspecially that of someone's face.
Because my brother is against PETA he defaced all their anti-fur ads.
by Anonymous July 07, 2003
what a hacker usually does to someone's website
why did you have to do such a bad job at defacing microsoft's website?!
by teh_applegoddess July 07, 2003
To remove your profile from Facebook.
A: I'll send you a message on Facebook.
B: Don't bother. I defaced yesterday. I'm sick of being a facebook slut.
by phoenix1x September 23, 2007
to remove a friend from your FaceBook page
I just de-faced that girl from my FaceBook page
by SoPhoebe November 20, 2008
To permanently block someone who was previously your "friend" from your Facebook page.
Jo I am warning you... if you post one more drunken high school photo of me than I will be forced to deface you.
by mckan514 May 13, 2009
Post sappy or embarrassing Facebook status, while intoxicated, that you will later regret.
I HATE all of you because no one ever likes my status or makes any comments at all ... hic

Sorry, everyone. I promise not to DeFace anymore.
by Defacer November 04, 2010