The act of going on Facebook and untagging yourself from incriminating photos. Whether it be cause your parents are getting a Facebook or you just don't want people to see you in embarrassing pictures from last night.
You: "Wow ..my mom is getting a Facebook"
Friend: "Haha, Dude that sucks, you have so many messed up pictures"
You: "Tell me about it, I'm gonna have to go on an untagging spree"
Bob and Amanda told me about Luke's, but since I didn't want Luke to know I was friends with those losers I untagged myself and met back up with them at the party.
Untagging yourself from pictures on facebook that may hurt your reputation in any way, shape, or form.
I.
Male A: "Dude, some chick tagged you in a picture where you're making out with her friend, untag yourself before your girlfriend see's that!"
Male B: *Reads text* "Looks like she already has, no more worrying about untagging myself anymore!"
II.
Female A: "Oh my gosh, this creepy guy I talked to when I was drunk took pictures of us and tagged me a few times, I hope people don't think him and I are actually friends!"
Female B: "Girl you need to untag yourself, you don't want any association with that!"
III.
When a relationship status turns sour and one (sometimes both) of the individuals untag them self from pictures with the old boyfriend/girlfriend.