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
ÉRic	er-EEK	French
Johnny	['dʒɔni]
Ikaros	-	Greek Mythology
Lutgardis	-	Ancient Germanic (Latinized)
Aritra	-	Bengali
Trendafilka	-	Macedonian