GIP NITALDown in Oz, top talent has an argot called “Rorrim Klat”. The code is formed by saying words backwards and it's used to make nasty comments about people without getting caught.
Top intellects can have entire conversations in the language, but ordinary folk use a core vocabulary of 20 to 30 key words.
If a word can’t really be pronounced backwards, a couple of letters will be switched around (eg "tihsllub" becomes "tishllub"). Or, some of the letters might be pronounced separately (e.g., “bmud” becomes “beemud”). Here are some samples: "roop reggub", "gib foog", "diputs epod", "elohesra".
Source. via Work Hate.