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"Oh my goodness", "oh dear", "wow", "crazy", "outrageous", etc. It was an expression Ricky Ricardo used on the sitcom I Love Lucy. It was typically used when someone did something out of the ordinary-- most notably Lucy Ricardo.
Ricky: Fred, why's Lucy acting so strange?

Fred Mertz: Lucy thinks you're having whoopie with that Grace Foster

Ricky: "Iyiyi!"
by BigRoyyy May 03, 2011
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