Severely intoxicated by drugs, especially marijuana. ("Squash" is a slang term for one's head or mind.) Sorry, I can't remember what we were talking about last night, I was stoned out of my squash.There's no way I'm letting you drive—you're stoned out of your squash!
stoned out of one’s squash
mod. alcohol or drug intoxicated. Britney will drink a little now and then, but she never gets stoned out of her squash.