When two or more people have a mindless heated argument on Facebook, whether it's through comments on profile pictures, profile walls, etc.
Person #1: You hear about the fight after school today?
Person #2: No, what happened?
Person #1: Did you see the facebeef on Samantha's profile picture? The one with her and her boyfriend John.
Person #2: Hahaha, oh yeah. Sam's ex left a comment asking if he was enjoying his sloppy seconds. Then John commented back and said he was gonna kick his ass.
The emotion experienced by urban dictionary editors that is caused by a massive overload of definitions of names which in turn is caused by a fucking annoying comment on facebook that urges idiots to post the definitions.
* Facebeek (to post things on Facebook, to use Facebook)
* Re-Facebeeking (the activity of performing Re-Facebeek action)
Term used to denote re-posting another person's Facebook post. This is intended to generically include anything that can be re-shared (status updates, posted links, photos, etc.) Its origin is in Tweet/Re-Tweeting for Twitter.