off one's box

Prepositional phrase

1. (UK, slang) Crazy; unhinged; irrational.
   • Say, if you call that acting well, you're off your box.1896, Surgical Journal, volume 2, page 227
   • "The conditions are disgusting aren't they?," he continued. "I don't know how people can. I mean, you'd have to be off your box to stay there for three days wouldn't you?2008 April 24, Gary Flockhart, “These Modfathers aren't all they're cracked up to be”, in The Scotsman
2. (UK, idiomatic) Stoned or intoxicated.
   • The 44-year-old has admitted to cleaning up his act of late, kicking well-publicised drug addictions and now leading a healthier lifestyle with regular exercise and a passion for fruit smoothies.
     He told the M.E.N. last week: "Innit just natural that when you're a kid you're off your box and when...2007 July 11, Dianne Bourne, “Ryder happy to toe smoking line”, in Manchester Evening News
   • Oh yeah, much happier, darling. I saw her smiling yesterday, a real smile and all. Not one of those weird ones she does, when she's off her box on the pills …2010, Martina Cole, The Family, Headline, →ISBN