This is probably not quite what you're getting at, but it's sort of related in that it relies on differences between insiders and outsiders. It does, however, involve the almost opposite use of the definite article from the example that you cite. I've noticed that Christians talk about themselves 'going to church' and Jewish people (for example) 'going to the synagogue'. Jewish friends of mine, on the other hand, speak of themselves as 'going to synagogue' and Christians as 'going to the church'. Sorry if this is a red herring - maybe it's because I'm currently 'into' Dorothy Sayers.