The long 'Oh' is usually used in order to emphasize offense in and caused by people you have never met. Often shouted loudly to cause extra discomfort.
Jim: You know the one thing bigger than my penis?

Joe: Your mom?

Random asshole: OOOOOOHHH!

Jim: That was funny until what's 'is face over there pulled 'The Long 'oh''
by Dong suck, the wonderdragon June 27, 2010

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