do your nut
do (one's) nut
To become very angry. Primarily heard in UK, Australia. If these kids don't start listening to me, I'll do my nut!
do your nutBRITISH, INFORMAL
If someone does their nut, they become very angry about something. I wanted to ask Lorraine out and I knew that Wendy would do her nut if she found out.
do your nutbe extremely angry or agitated. British informal
In this phrase and in off your nut below, nut means ‘head’.
do your ˈnut(British English, informal, spoken) be very angry or worried: He’ll do his nut when he sees all that mess. ♢ She’s doing her nut because she hasn’t heard from her son for weeks. She’s sure that something terrible must have happened.
Nut is an informal word for your head.