British Slang: Off One's Nut

Off one's nut:

Not in one's right mind, crazy, mad, confused.

Examples:

You can't do that! Are you off your nut or what?

Tom was declared 'Off His Nut' when he saw an alien steal his baby.

Meaning of nut from the English-Bulgarian dictionary:

Walnut, hazelnut, peanut, etc.

Meaning of the slang nut.

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