round the twist
Also found in: Acronyms, Wikipedia.
round the twist
Crazy; mentally unsound. Primarily heard in UK, Australia. I think Jane's grandmother is a little round the twist these days. You must be going round the twist if you think that's a good idea!
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
round the twist
BRITISH, INFORMALIf you say that someone is round the twist, you mean that their ideas or behaviour are very strange or foolish. You would have to be really round the twist to get pleasure out of this. This man's round the twist. Note: You can say that someone goes round the twist if they start to behave in a crazy way, often because they are bored or annoyed by something. Most of them go round the twist in the end, you know. His predecessor killed himself. I'd go round the twist if I didn't work. Compare with round the bend.
Collins COBUILD Idioms Dictionary, 3rd ed. © HarperCollins Publishers 2012
(drive somebody/be/go) round the ˈbend/ˈtwist
(informal, especially British English) (make somebody/be/become) crazy: I’m going round the twist trying to repair this machine. Nothing I do seems to work. ♢ He practises the same tune all day; it drives me round the bend (= annoys me very much).Farlex Partner Idioms Dictionary © Farlex 2017