Alan,
My guess is the "back to the country cow" is a cow going back to the farm versus a one-way trip.
Don't ever get caught up in the hoopla of the actioneers. Jargon speak is going to vary from sale barn to sale barn. If there is something I don't understand, and I am interested, I get a clarification. If someone gets a laugh out of me, that's okay too. Believe me, those boys want my nickels - and it is my nickels we are talking about.
I've seen guys buy the whole pen when they thought they were bidding on choice of the lot. In fact, if you hang around those sale barns, you'll see practically everything, and you'll hear it referred to in all kinds of terminology. Best thing is to be sure you understand before you act. They know if they tick you off, you won't be back.
Edit: Shucks. I misread mnmtranching's post. That was a good explanation.