Search Result for "space cadet":
Wordnet 3.0

NOUN (1)

1. someone who seems unable to respond appropriately to reality (as if under the influence of some narcotic drug); 



The Collaborative International Dictionary of English v.0.48:

Space cadet \Space cadet\, n.
   a person who appears disconnected from reality, or living in
   his own world; -- sometimes used of people who are under the
   influence of mind-altering drugs. [derogatory]
   [PJC]


WordNet (r) 3.0 (2006):

space cadet
    n 1: someone who seems unable to respond appropriately to
         reality (as if under the influence of some narcotic drug)