Wag

[Douglas G. Wilson]

Here from AP ...

http://apnews.myway.com/article/20040708/D83MSLSG2.html

... is the word "wag":

<<Anthony Cordesman, an Iraq analyst with the Center for Strategic and
International Studies, said the figure of 5,000 insurgents "was never more
than a wag and is now clearly ridiculous.">>

I believe I recognize it as an acronym for "wild ass[ed] guess". But is it
well-known to all, so that it need not be defined/explained in the article?

Is it in any dictionary?

Should it be?

-- Doug Wilson