1) A combination of people who use MySpace and/or Facebook. These people are known to have little lives, just because they sit at their computers all day doing nothing. Many celebrities use these websites to show off- (see "Face-brag"). Also known as "MyFace".

2) A book in space.

3) A book talking about space, as in outer space, or just plain old space.
1) Bobby: "Jeff uses Facebook and MySpace... what a Spacebook."

2) Astronaut: "Oh my God! It's a spacebook!"

3) Guy: "Wow, this spacebook really does give a lot of information about the universe!"
by Cheesapuffa July 8, 2009
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An unspecified (amount of) social networking site(s).
Dude josh has his camera out again. This entire party is going to end up on spacebook again so we should watch what we drink.
by alex tetreault February 26, 2008
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interacting on facebook while under the influence of a mind altering substance especially including but not limited to marijuana and alchohal.
"Dude last night I smoked like three bowls and and jumped on spacebook.
by frankyfarts May 11, 2010
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a term that is usually linked to those people who not only have either just a myspace or a facebook but both; in this sense, this term is used to save time when referring to both myspace and facebook together as one.

also known as : facespace, mybook, or myface
Guy 1 : Man I'm so tired

Guy 2 : Why, what's up?

Guy 1 : I had to organize my spacebook, it takes so much longer now that i have two!
by fidy50cent August 11, 2008
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A MySpaceFaceBook conglomerate, since, interchangeably, one wants to be like the other so bad and continues to remodel its own site to keep up with the other, to the point at which they might as well be one and the same, your preference depending on which ones your e-friends use at any given point in time.
Me: Wow! Take a moment to gaze upon my most contemporary Kodachrome on Spacebook. It was contrived by myself for my colloquial photography class, and so I request your arbiter conjecture in the form of a comment.
You: wUz U tAkIn BoUt MaNg? i AiNt GoTz No SpAcEfAcEcAkEs? U fInD MeH oN mYySpAaAaZzZe My NaME iS hOtTaYbOoTaYaKaShAbItCxZH!
by UberLemon June 7, 2009
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1. a noun referring to both competing websites - myspace and facebook.

- "dude..do you have a spacebook?"
- "no...but your mom does!"
by Hannah Holcomb October 15, 2008
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an expression used to illustrate the (limited) interchangeableness of two popular social networking sites, which is amplified by the facts that each site's title is a compound word and one of the words compounded into one site's title rhymes with one of the words compounded into the other site's title
I'm friends with him on both myface and spacebook.
by thekingofallsocialmedia April 14, 2010
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