Atomic Meltdown
Any person in a "management" position who just freaking loses it and starts pounding on their desk and throwing anything within reach like staplers, phones, paperweight etc.
My boss is such a dumbshit that he totally botched up the sale and lost the customer account so he had an Atomic Meltdown and destroyed his office.
Atomic meltdown
After a particularly undercooked meal atomic meltdown can occur, leaving toxic sludge on the back pan of your toilet from violent diarrhoea.
After that curry last night I had the worst atomic meltdown, the Mrs vomited cleaning the toilet afterwards.