What it means
To do your nut means to properly lose your temper and kick off. It's a very British way to talk about that moment when someone's been pushed one annoyance too far and suddenly they're fully raging over something daft, petty, or just badly timed.
Usage examples
"Dad did his nut when he saw the dent in the car, you could hear him three streets away."
"Dad's going to do his nut when he sees the dent in the car."
"She did her nut when the delivery turned up smashed for the third time."
"He did his nut at the self-checkout 'cause it kept saying unexpected item in the bagging area."
"Mum'll do her nut if you leave that wet towel on the bed again."
