Oopsies

Amber: Right! Oh, except three times eight is twenty-four, not twenty-seven. Me: Oh. Oopsies. (Erases answer) And now for this one . . . (scratches in answer)

Source: wiktionary

Kris threw the gear shift into park. “Back at the van at 5:15 p.m.” / “You know you told Bree it was 6:30, right, Coach?” Ashley said. / “Oh, oopsies . . . let’s make it 6:15 still. Ashley, can you text Bree?[…]”

Source: wiktionary

“Why, hello, my little fairylets!” said the hedgehog. “How about a hug?” / Oona and Horace looked at each other. “Sure, Grandgoop,” said Oona. “But do you think you could be a little less pokey first?” / “Oh, oopsies. I can’t find my saltshaker, so I thought if I was the size of a saltshaker, I might have an easier time finding it,” she said.

Source: wiktionary