Definition of oopsie in US English:

oopsie

(also oopsy)

exclamation

informal
  • Used to show recognition of a mistake or minor accident, often as part of an apology.

    ‘oopsie, our mistake!’

noun

informal
  • A minor mistake or accident.

    ‘we've fixed our oopsie’

Origin

1950s: perhaps shortened from oopsy-daisy, or perhaps from oops + -y.

Pronunciation