O. Z. stands for being
overzealous, a brain disorder. Those afflicted do not know when to stop - planning a party down to the most minute detail,
decorating a room or giving an endless stream of gifts on Christmas when a few would more than suffice. Frequently mis-diagnosed in children as industriousness or generosity, by
adulthood it's incurable.
Example:
"I'll just tidy up", she said, heading for the kitchen, "a few minutes." Hours later she emerged, having rewashed the clean dishes, glasses and cutlery,
scrubbed the floor, wiped, re-wiped and sterilized the counters, thrown out loads of perfectly good food to
neaten the fridge and arranged their
Urban Dictionary mugs in alphabetical order, her O. Z. out of control.