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
Steenie	-	Scottish
Dewayne	də-WAYN, DWAYN	English
AdriÁN	ahd-RYAHN (Spanish), AWD-ree-ahn (Hungarian)	Spanish, Hungarian
Berko	-	Western African, Akan
Klim	-	Russian, Ukrainian
Nawal	-	Arabic