o is an interjectionspeaking of which stated in bold you said "o" which should be "Oh" and your grammar also blows. "i'm" should be "I'm"
one definition from dictionary.com: Used to express surprise or strong emotion: “O how I laugh when I think of my vague indefinite riches”
and i'm a spelling nazi, not a grammer ninja //content.invisioncic.com/y282845/emoticons/wink.gif.608e3ea05f1a9f98611af0861652f8fb.gif
