I agree that you shouldn't speak like that but not because it shows a lack of education, rather when you learn a language you should learn it correctly. Only once you feel confident enough and your level is high enough to sounds natural when you use such "short-cuts" should you use them. Sluz, I find your comment to be rather racist, not all black people who speak like that are not well educated, plus, not only black people speak like that. For areas, these "short-cuts" are part of the accent and have nothing to do with education or skin colour. To the asker: Sorry but I don't think your English level is high enough to start learning slang

That's not really slang, it's more bad grammar and using verbal shortcuts. Frequently the -ing sound becomes simply -in in oral conversation. Also, auxillary verbs are sometimes dropped, especially among black people. Examples: What you doin' = What are you doing? How you been (pronounced bean) = How have you been? Where you going? = Where are you going? What-chu want? = What do you want? Don't speak this way though, it shows a lack of education.

Hi Hesham, this sort of slang sounds odd when spoken by someone who is not a native speaker. Richard's comment about a lack of education is an excellent point.

I would say that's less of slang and more of dialect. You'll probably only find that in America. Slang would be more like instead of saying "I like that" you say "cool", a specific word or phrase that replaces another rather than just pronouncing thins slopily (which nobody should do!). Hope that helps.