title_body: Anti-Newspeak, making a language harder
upvoted_answer: Implement some "levels of trust" in the language: Design phrases or word choices that signal the initiated that you are talking to non-trusted people or that non-trusted people may be listening, design other phrases that signal that you can talk more freely.
  
  I have heard (but I don't have hard references for this) that travellers and gypsies in Europe have such devices in their languages.