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
Izrail	-	Judeo-Christian Legend
Maksym	MAHK-sim (Polish)	Ukrainian, Polish
Chatzkel	-	Yiddish
Oanez	-	Breton
Natalie	['nætəli]
Karly	KAHR-lee	English (Modern)