Definitions for oopsʊps, ups
Random House Webster's College Dictionary
(used as an exclamation of mild dismay or chagrin, as at one's own mistake or blunder.)
Origin of oops:
1925–30; orig. uncert.
Kernerman English Learner's Dictionary
indicates you realize you have made a small mistake
Oops, I deleted the wrong paragraph.
Acknowledging a minor mistake.
Oops! I left the lid off the ketchup.
Used sarcastically to acknowledge a major mistake.
Origin: A presumably 'natural' exclamation, only attested since 1933, possibly altered to (or from) whoops (attested since 1933)