1 definition by Istvan Sengir

Top Definition
(Face Book Best Friend). (n) a person that you do not know at all, but for some reason feel the need to respond to any number of your posts as a close friend.
Sally: No feeling 100% percent today.

FBBF: I am so sorry to hear that.

Sally: Thanks, to my newest FBBF.
by Istvan Sengir May 14, 2010
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