Language is language. I don't see a point in a separate section for slang. I don't see what you mean by psuedo and not associated with Russian. The slang I see is all based almost entirely on Russian, not on loan words from other languages. It seems you are more concerned with people getting the wrong impression about the Russian language because of slang and perhaps confusing the language of Pushkin with that of a street thug. If someone is studying Russian and they can't tell the difference between those sources they need to study harder. Furthermore, a beginner may not know where to post, as he wouldn't know if a word was slang. And there are gradations of slang, slangy for example, may not be fully slang. Besides, there are очень много Russian slang sites and dictionaries on the web.