I don't claim to know who coined the term Nork, or when, but it has been slang for them in the US Army for a while.
In a similar vein, as I was going through the mil intel school, we had an exercise where we had to take on th eroles of a Div staff and plan a counter attack into N Korea. I was the Div G2 (intel guy). One of the items I had to brief was the North Korean Center of Gravity (that which the enemy relies on and if you take it away you can more easily defeat them). Yes, I knew the text book answer they wanted was their Arty.
Well, we had some general officer take our brief and I briefed: Sir, I have identified the North Korean CoG as 'People Named Kim'. If we were to destroy 60-70% of 'People Named Kim' it would lead to the defeat of the Norks.

For some reason he didn't see the humor in that.

That is what they get for turning a hard core combat arms guy inti an intel guy.
