Duhno

Duhno: interjection. An exclamation used when a fact or statement to which the response is quite blatantly negative. Examples of questions to which this would be an appropriate response include: "Ok, sir/madam I'm finished how does this look? Should I cut a little more off the back?", " Excuse me sir/madam, do you have a moment to talk about Jesus Christ?" or "We don't have Coke, but would you like a Pepsi?"