(Pronounced: o no you dit-ten) A colloquial expression of incredulity, voiced upon witnessing another's action or statement.
In the car today: Beckham: Mom - Watch! I can put this lid back on by myself. Me: Why don't you give it to me so I can put it on tight for you. Beckham: Mom. I can do it by myself. You probably can't do it because YOU'RE A WOMAN.