be off (one's) nut

slang To be crazy or eccentric. 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. You can't tell people you want to start a business selling bees as pets—they'll think you're off your nut!

See also: nut, off

See also:

off (one's) nut
off one's nut
off rocker
off your nut
be off (one's) trolley
do (one's) nut
do your nut
be off with you
be off (one's) rocker
be well off

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