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
Arik	-	Hebrew
Helma	HEL-mah	German, Dutch
Sendoa	-	Basque
Aslanbek	-	Chechen, Ossetian, Circassian
Tamra	TAM-rə	English
Harland	['ha:lənd]