1) All over the mental map 2) Eccentric 3) High 4) In and out of la-la land 5) In la-la land 6) Like airheads 7) Like an airhead 8) Like mork 9) Like potheads 10) Oddball 11) Off in the ozone 12) Out of it 13) Out of touch with reality 14) Out there 15) Spaced-out 16) Spacey 17) Unconventional 18) Unfocused 1) Spacey 
Spacy is slang for disorganised; out of touch with reality.