Someone who is either an idiot, or spends too much
time taking
drugs. Someone who shows signs of minimal
intelligence and/or common sense.
This phrase can be used in an offensive or a friendly context.
"Look at that prick, he's fuckin tuned to the
moon, so he is"
"Ah've goat my giro, ah'm gonna be well tuned
tae the
moon the night so ah am"