off (one's) nut

off (one's) nut

Crazy or insane. I think you're off your nut for changing careers this late in life, but, hey, follow your dreams. He's off his nut if he thinks he can get that engine fixed by this weekend.
See also: nut, off
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.

off your nut

out of your mind; crazy. informal
See also: nut, off
Farlex Partner Idioms Dictionary © Farlex 2017

ˌoff your ˈnut

(British English, informal, spoken) crazy: Is he completely off his nut?
Nut is an informal word for your head.
See also: nut, off
Farlex Partner Idioms Dictionary © Farlex 2017

off one’s nut

1. mod. crazy; out of one’s head. Don’t pay any attention to her. She’s off her nut.
2. mod. alcohol intoxicated. Those guys are so off their nuts!
See also: nut, off
McGraw-Hill's Dictionary of American Slang and Colloquial Expressions Copyright © 2006 by The McGraw-Hill Companies, Inc. All rights reserved.
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