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
Ike	[aik]
SÉGolÈNe	-	French
Vasiliki	-	Greek
Cecelia	sə-SEE-lee-ə, sə-SEEL-yə	English
Noora	NO:-rah	Finnish
Nancy	NANT-see	English