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1.
FaceBook Friends After.

When you become friends on Facebook after you hook up, most likely after you have just met them resulting in a one night stand or lasting relationship.

This can also be used when hooking up with someone you didn't think was important/worth adding as a friend before the hook up.
Joan: Sarah just added George to Facebook?
Marla: Yeah they are totally FBFA...
Joan: Oh snap!

Josh: Why did you just add my brother to Facebook? Don't tell me you are FBFA!
by _that_slut March 22, 2009
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