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"