out of question — impossible; not to be considered; completely unacceptable

a frazzled waiter approaches the head chef holding an order slip with an urgent expression. The waiter gestures desperately while the chef immediately shakes his head and waves his hands dismissively. The chef points to the packed kitchen with dishes piling up and multiple orders cooking simultaneously. Steam rises from overworked pans while other kitchen staff rush around frantically in the background. The chef's firm rejection shows this additional complicated order is completely out of question during the dinner rush. something being impossible and not to be considered