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1.
A person who isn't all there, or talks about wierd things...wierdo
You done preachin now spacehead?
by knighto October 23, 2007
 
2.
The act of performing fellatio in the vast vacuum of space,includes sex acts performed by aliens
Sam gives some mean as spacehead.
by mrwilson December 12, 2011
 
3.
Getting head in space. The one thing greater than road head.
some guy: yo dude those alien skanks totally gave me some space head

some other guy: shit dog, that's pretty xtreme
by Will Maxwell May 12, 2008
 
4.
A person whome has reached a high degree of addiction to "myspace" which can be easily juxtaposed with that of a serious narcotic.
That Kevin is a spacehead.
by Kevin West August 01, 2006