In Michael Bishop's SF book Transfigurations (1979), the author (in the course of the narration by the main character) refers in several instances to one or another "debussy", by which he evidently means a bathroom (i.e. a loo/WC/toilet/washroom, depending on your local usage).
I've never encountered this elsewhere and searching has turned up nothing. Is this an invented usage of the author's, or is there some precedent somewhere?