being logged on to myspace and facebook at the same time.
Hey bob, what are you doing?
Oh nothing sheril just mybooking, all the cool kids are doing it.
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When one is both on myspace and facebook at the same time
Tom: Hey dude! Are you online?
Matt: Yea man! I'm just mybooking!
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Combination of myspace and facebook; synonymous with facespace, spaceface, spacebook, myface, and any other combinations of the two words.
-Hey did you see the pictures I put up on mybook?
-Nah man I was checking facespace all day today.
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the combination of MySpace and FaceBook when you don't give a rats hairy ass what is going on in others lives
Girl 1: OMG! Did you see what Sarah posted on her wall?
Girl 2: I don't have facespace / mybook and don't really care.