lol ok well, firstly where are you from? cos if your some posh person you wont be able to get away with it as your tone of voice will give it away
also , where do you wanna be from? london? glasgow? yorkshire? wales?
cos im from london so i would be able to help you with london but also theres ghetto slang, which is harder to understand, so let me know and ill see of i can help you