I had colleague who taught first graders that liked to whine and complain and tattle on each other. She made a giant paper ear and stapled it to the back wall. Anyone who needed to whine, complain, or tattle would get the comment, "Talk to the ear." She was then able to continue with the task at hand. And as funny as it sounds, it worked. Because the next year when I had the same students as second graders there were significantly less instances of annoying language. I don't know if it would work for your ODD kid but it might be worth a try.