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1.
when you get on Facebook so early in the morning and change your status (etc) and don't remember it later on in the day
Person 1: Wait, I don't remember putting this status up here...

Person 2: Were you sleep-facebooking again??
by crazydrummajor April 01, 2009
 
2.
Facebooking while you are partially asleep.
Dude i was sleepfacebooking early in the morning... god knows wat i typed.... i am sure it was all barf!!
by whirlwind84 May 05, 2010
 
3.
When your Facebook status message says "is sleeping."
If Amy's Facebook status says, "Amy is sleeping," Amy must have been sleep-facebooking.
by CitizenJ September 21, 2009