Sulu from Star Trek -WHY does he say 'oh my'?

Just the way he's saying it sounds like it's referring to something specific, like an in joke, but I have no idea to what. When did he first do it? I've seen it on a commecial he did, he was just on The Neighbors and said the line when his character entered, and I've heard it elsewhere. It's... show more Just the way he's saying it sounds like it's referring to something specific, like an in joke, but I have no idea to what. When did he first do it?

I've seen it on a commecial he did, he was just on The Neighbors and said the line when his character entered, and I've heard it elsewhere. It's driving me crazy. What is it a reference to? A stage play he was in? He certainly didn't say it on Star Trek.
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