Thread: "Where do you get off....?"

Expression is almost always used as response to some kind of arrogance, presumption, misbehaviour, inconsideration, some thing bad.

Meaning something like 'Какое безобразие!'.

On question about origin, anyone know when it started to appear in films?

Another idea from left field, is a possible source from idea of 'schadenfreude': 'get off' also means get pleasure, get kicks, etc. And so a possibility is from idea like "where do you find joy/pleasure in being such a louse/heel/low down dirt so and so etc."