Cody Simpson's new song featuring Flo Rida. iYiYi means I but continuously.
iyiyi (sounds like I-i-i-i-i).
"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