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1.
Meaning: cool,awesome, weird, wonderful, or any like words. An expression or exclamation of greatness.
Check out that lime green raincoat! It´s totally space tits!
by Harry Hanson September 12, 2005
 
2.
When breasts are so large &/or fake that they seem to defy gravity.
Her space tits will never sag, yo.
by fred ledge July 07, 2011