oops [exclamation] [informal] - said when someone has (almost) made a slight mistake or (almost) had a slight accidentWhoops! I think I've given you the wrong change."Whoops!/Whoops a daisy!" she said, as the little boy tripped and fell over the door step.Whoops! Mind you don't spill your juice.
WHOOPS
Meaning of WHOOPS in English
Cambridge English vocab. Кембриджский английский словарь. 2012