The usual spelling of the exclamation is just "uh oh" although the extra H could indicate an extension of the sound as in hmmm or welll. This could be called a "singsong" uh oh.
The common variation in "uh oh" is an extension of the time "between" the two syllables.
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The exclamation of pain "ow" has extended length as "oww" or longer.
The similar words are "owe" (to have a debt) and "owl" (a nocturnal bird of prey).
The spelling "oops" is correct (expression admitting error, synonymous with "whoops").
That is the correct spelling of the exclamation "uh oh" (used when encountering a bad situation, or some problem or difficulty).
The interjection is spelled "oops" (mistake or misstep), e.g. "Oops! I dropped it."
The slang "ops" is short for "operations" (usually military).
Oops ! I did it again.
It's an exclamation.
Oops not ist. -ness
Regarding Boat and ships: Aft Regarding golf: Oops, call 911
You would spell it "Uh oh!"