Yes, my wife and I use coded language all the time. All our neighbours are referred to by their code names not their real names, amongst ourselves. We live in France so when ever we spot a British person (so easy to spot you can tell by look you don't have to hear them speak) we say "partout" (as in "les anglais sont partout": the English are everywhere, something I think a neighbour said to us once) or simply "Les"