Pronounce it just the way you see it and you'll fit right in over here.
They LOVE to use this expression that means anything from, "oh my goodness" to "I can't believe you just did that" to "you're being annoying." I think it can be substituted for eye rolling pretty easily as well.
I hear it being used by pretty much every person imaginable. This coworker of mine in particular absolutely loves this expression and after discovering I couldn't stand the way it sounded he decided to use it every chance he could in my presence. Thank you Jeremy.