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.
by The Joker in Bruges February 9, 2009
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Arguments on facebook that no one would engage in, in real life
Austin: Holy shit, jess and nikki have been hating on each other through facebook for weeks now.

Dan: ya i know they got that facebeef
by hahahhahhahahahhaha April 27, 2011
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A term referring to a "beef" or disagreement between two people, usually used by an observing third party.
Freds status: Life is a gamble, and im holdin the poker chips.
Rob comments: Fuck ya poker chips
Fred comments: Who the fuck are you dick
Dave comments: lol Facebeef?
by Ish The Fish LP September 30, 2009
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