Indy has a larger vocabulary then I can understand. When he gets on a roll he starts talking so fast I can't understand him. Last year I happened to video tape him when he was on one of his tangents. When I played it back it was clear as day "Whatch doing Indy?"... something I say to him all the time!
You may want to try taping him and then playing it back, or as others have said it usually gets clearer with time!