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2.
to have sexual intercourse with a woman with an exceptionally large/loose vagina
"blimey sean" "I thought kev's next door neighbour was quite tasty 'til i gave her one - no good - lost in space"
by theWestHamfan December 10, 2003
 
1.
To get drunk with friends.
CM: Hey yo! lets get lost in space this weekend!

SJ: Sounds good!

DG: Im Lil Wayne and im lost in space!
by Arab Money 802 June 09, 2009
 
3.
When a guys dick is so small it practically gets lost in your cooch.
Wow, I didn't know Jhon was so small. Last night we finally did it and he got lost in space.
by x3 x3 November 10, 2005