oops

exclamation2

1. •
   (informal) showing that the speaker has noticed they have just made a small mistake

   • Oops! I left the lid off the ketchup.
2. •
   (informal) Used to indicate mild surprise or shock.

noun1

1. •
   A minor mistake or unforeseen difficulty.

   • It's an oops, but one that's your fault, not your puppy's. — 2011

verb1

1. •
   (informal) To make a mistake; to blunder.

noun1

1. •
   Abbreviation of object-oriented programming system.