Learn English – How to best correctly spell this sound

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Remember back in school (or still in school, like me) when someone got called to the office and all the kids in the class made an 'ooou' sound with the intonation slowly rising? Yeah… Anyway, I was just thinking about it, and I was wondering what the best way of spelling it would be so other people would understand how it was said, or pronounced?
Also in music, vocalists might use this sound, but people who interpret the lyrics put something like 'ohh' which is definitely not the same.

So what do you think the best way of spelling it would be?

If you don't know the sound I'm talking about, say 'you', but without the 'y'.
If you're taking Spanish like me, it's the Spanish 'u'.

Best Answer

I'd go with ooooh, and let the reader work out the pitch change from context:

"I'm so sick and tired of you always asking me questions, Benjamin! Pack your things and report to the principal. I won't have you in my class." Mr. Smith yelled. Benjamin's class mates mocked him "ooooh" while he quickly packed his things and left.

or

"I'm so sick and tired of you always asking me questions, Benjamin! Pack your things and report to the principal. I won't have you in my class." Mr. Smith yelled. Benjamin felt on top of the world and his class mates cheered him on "ooooh" while he packed his things and left for principal Puddlefrock's office.