Off your trolley
Definition 1 of 1
Pro Tip 1/3Informality
The phrase is informal and often used in casual conversations or humorous contexts. 
When Steve wore socks with sandals, his sister said he was off his trolley.
Pro Tip 2/3British Origin
It’s a British phrase, so it's more common in the UK than other English-speaking countries. 
After hearing his bizarre plan, his friends chuckled and remarked, 'You're off your trolley, mate!'
Pro Tip 3/3Emotional Exaggeration
Often used to exaggerate for effect, not literally calling someone insane. 
She bought all the concert tickets - she’s completely off her trolley!