Definition of "oh" []

• Used to express strong emotion, such as surprise, fear, anger, or pain. (interjection)
• Used in direct address: Oh, sir! You forgot your keys. (interjection)
• Used to indicate understanding or acknowledgment of a statement. (interjection)
• Zero. (noun)

American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

• "December 28, 2007 at 11:51 am oh IBK……dat eaz ….dat waz…..oh teh fooey….ai dont hab teh werdz fur wat dat waz….."
• "I don't see religion, I don't meet someone and say 'what are you? oh, Mormon..oh sorry no thanks!'"
• ""Oh, oh, _oh_!" screamed Grace, pressing her hands tightly before her eyes."