The process of logging onto two Facebook accounts, one being yours and the other a friend's or a relative's. One may go through this process in order to post funny statuses, Wall posts, etc. on the friend's account and then comment on them using their own Facebook for the sole purpose of humoring himself.
Person: "I'm bored. Luckily, I know the password to <insert friend's name here>'s Facebook. I think I'll do some dual-booking to pass the time; I've got a plethora of funny things to post on his Wall."
by steelsoul November 09, 2010

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