CoD6 or MW2?

My school friends get mad when I call the new Call of Duty game, Modern Warfare 2, CoD6. They say that of you abbreviate it, it has to be MW2. I disagree, but whatever. If you abbreviate Call of Duty 6, what do you call it?

Only ******s call it COD6.

It's WaW not CoD6
MW2 out ranks WaW by a long stretch...

Where did Call of Duty World at War come from he was talking about MW2 the entire time might wanna read it again