Wikipedia:Articles for deletion/List of Internet slang phrases (3rd nomination)
Yes. But as it says there, something like  "should generally be avoided, or at least, supplemented with some more arguments" and in my opinion this is a case where its sufficiently  (and relevant to a computer-medium encyclopedia, where I just had to look up CMIIW via Google a few minutes ago as it was used on another talk page) that it might over-ride the basic bias against using the argument/reason. An encyclopedia lists its own internally-used abbrieviations not because tehy're encyclopedic but because they are necessary, and understanding computer-ese is oftentimes necessary to navigate discussions here. Still, I continue to (weakly) favor deletion for just this reason: Utility is insufficient justification for keeping it
— User:JJL, 17:19, 25 October 2007 (UTC)
Stance: comment
Cited policy: WP:USEFUL||WP:USEFUL (Wikipedia:Arguments to avoid in deletion discussions)