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1.
Originally coined by Jason Hatcher in early 2007. It is the short form for the activity of sending messages to friends through the popular online social utility "Facebook".

See also: Effin, Effing, Fooking, F'in, F-ing, Fook
This is a great party. Thanks for F-booking me last night. (ie: thanks for using facebook to let me know about this event)

I was going to send you an email but decided to f-book you instead.
by Jason Garett Hatcher June 15, 2007