don't you find that the restriction of using words until it is listed in the "dictionary" is completely arbitrary? slang or vernacular forms of language has always existed. If a guy came up to me and started speaking the way Shakespeare wrote I wouldn't understand half the things he said, but I guess he would still technically be correct in his usage.
my high school english teacher said that he always had a book on the usage of commas on him in case he had to argue with his professors, which apparently he had on several occasions and won. While being in command of language is important, the english language has many more caveats than I would like, while acceptable procedures in math is the same regardless of region.