Oop

You could say 'Oop' if you are embarrassed about something, or if a conversation just ended suddenly. Most of the time, people say 'Oop' during texting. You may find someone say 'If somebody said 'Oops' it means they've made a mistake like falling.

Mary: Is this emoji a duck face 😗?

Max:No, that's a kissy face.

Mary: Oop