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"