He's Jamaican and apparently this is normal in that culture, I am yet to have this confirmed... I can't remember when i first noticed he had this habit but after 5 years, it is REALLY grating on me.
Its like this low rumble of thunder from the other room, usually incorparating a Ja'can swear word like bumboclaaat or raaaasclaaat (or any other variant ending in claaat.) He can be talking to himself about anything, usually having a winge, and quite often about me or something I have done.
I have tried asking him not to do it but he seems to think that that is asking too much since it is a habit of a lifetime. I also sometimes confront him about what he has said and he will deny it! I have also tried to tell him that in England, it is a sign of maddness to talk to yourself but he finds this funny because in Jamaica they have a joke about the English being mental.
I'm really at the end of my tether with it. Any suggestions other than divorce????