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
Priska	-	German, Biblical Greek
Damian	['deimiən]
Haskel	-	Yiddish
Shaquille	-	English (Modern)
Palmer	PAHL-mər, PAH-mər	English
Tommaso	tom-MAH-zo	Italian