Found 2 items, similar to space cadet.
English → English (WordNet) Definition: space cadet space cadet n : someone who seems unable to respond appropriately to reality (as if under the influence of some narcotic drug)
English → English (gcide) Definition: Space cadet 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]