ooh (interj.)

exclamation of pain, surprise, wonder, etc., attested by 1916. The number of -o-s may vary. Combined with aah from 1953. Ooh-la-la, exclamation of surprise or appreciation, is attested by 1918, from French ô là! là! and suggestive of the supposed raciness of the French.

France is one fine country and we have been having a pretty good time. The people treat the Americans very well and the pretty girls,—'ooh, la, la!", as they say. ["The Princeton Alumni Weekly," May 29, 1918]

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Definitions of ooh

ooh (v.)
express admiration and pleasure by uttering `ooh' or `aah';
They oohed and aahed when they unwrapped the presents
Synonyms: aah