A combination of the social networking sites MySpace and Facebook where you can avoid having to actually get out of bed to see your flatmates or find out about the lives of people you once knew.

(See also: MyFace)
My ex just added me as a friend on Spacebook.

Yes, I already know you're engaged, it said so on Spacebook!
by eblyatrom February 22, 2007
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When you are on myspace and facebook at the same time. Which is only used when you have at least 512 mb ram. Otherwise your computer would blow. Users at this point are highly addicted and become edgy if there is a problem with either website.
Brad: Hey waitaaa minute let check up on the spacebook real quick.
Jeff: Nah man you'll blow up my computer
Brad: Come on man quit taxin my gig
by the steezo April 19, 2007
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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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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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flippin between myspace and facebook.
I'm spacebooking tonight, playing mafia at both myspace and facebook.
by samiam6977 August 30, 2009
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