Top Definition
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

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