oops
"a natural exclamation" [OED] of surprise at doing something awkward, but only attested from 1933.
whoops
exclamation of dismay, 1925, variant of oops.
I got so exited yesterday when I checked August park hours & they had added lots of EMH days to MK & MK was open until 11:00 everynight. Of course, I posted the news right away & then realized I was looking at July hours.
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