be pot luck

be pot luck

If you ask someone to have a meal at your house and you tell them it will be pot luck, you mean that you have not planned it or prepared any special food. Note: `Pot luck' is usually written as `potluck' in American English. `We'll just be casual and eat in the kitchen. It's just pot luck,' Moira said. `Hope you don't mind.' Note: A potluck is a meal at which different guests bring different parts of the meal.
See also: luck, pot