I've seen the occasional reference to Dah Nah in some of the older posts... What is it?
Dee-Nee - The offical sound one makes for the selection of a pinch hitter, coined by Potsie though used by all. Dee Nee has become a very local phenomonon here in Chicago, as we pretty much utter it whenever anything benefital happens to us, RBI or otherwise.
Dah Nah - The anithesis of Dee Nee, uttered whenever anything bad happens to you. Term originally coined by Jason Brand, who uttered it in a seriously butchered attempt to say Dee Nee. We found it so funny that it became the "anti Dee Nee"
Now, there was some non-sense where Gantry and his friends were known as Dee-Nees and the people from the RBI forums were known as Dah-Nahs. There was a plan to make a RBI ROM that pitted the Dee-Nees vs the Dah-Nahs. I'm assuming it never got made, and the idea died a long painful death.