The way real people actually speak. To be contrasted with Proper English or the even more antiquated Received Standard, the speaking of either of which today in many situations will lead to strange looks, chuckles, sneers or cries of "Speak fucking English!" Reflective of the modern trend away from conformity, rigidity, artificiality and snobbery toward autonomy, creativity and the rejection of propriety.
Aaron: Good Day, My Good Man! I say, may I inquire as to the freshness of your pomegranates? Old, dry fruit is something up with which I will not put!
J.B.: Whoa, Homie, you talk like that around here and you'll get your ass kicked! You'd better check out the internet and learn how to speak fucking English. Urban Dictionary English can save your pathetic ass, Dweeb.