be off (one's) nut

slang To be crazy and/or wacky. Usually used humorously. Don't listen to a word he says, he's off his nut! You're off your nut if you think that plan will work.

Common Names:

Name	Pronounced	Usage
Jo	JO (English)	English, German, Dutch
Richardine	rich-ər-DEEN	English (Rare)
Chastity	CHAST-i-tee	English
Armando	ahr-MAHN-do (Spanish, Italian)	Spanish, Italian, Portuguese
Hills	[hilz]
Ellen (2)	EL-lən	Dutch