Quote Originally Posted by Seraph View Post
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 find joy/pleasure in being such a louse/heel/low down dirt so and so etc."
That's an interesting idea, Seraph, but I don't think that "get off" in the sense of "have an orgasm" is the source of the phrase "Where do you get off?" (And note that although it's possible to say "I really get off listening to baroque music", with the meaning "I absolutely love baroque music", the underlying meaning is "Baroque music gives me an orgasm."

So, "get off" in the sense of "get pleasure" is very slightly vulgar, and you wouldn't hear it in a G-rated Disney movie for young kids -- however, it's not X-rated or NC-17 "vulgar". I'd say it's PG-13 -- one can say "I get off on this music" in front of a teenager who's old enough to дрочить, in other words!

But if you wanted to combine both senses of "get off," you could do it like this, as a response to someone using the expression "where does so-and-so get off":

Mary: Where does he get off, speaking to me in such condescending tones?! (= "Does he think he's some kind of royalty?")
Cindy: Hmmm, I'll bet that he does get off, speaking to you like that! (= "It gives him near-orgasmic joy to be condescending to people")

But note that in this example, Cindy is deliberately using wordplay (by repeating the phrase "get off" with the proper wink-wink-nudge-nudge tone), and that Mary was not hinting at pleasure or "kicks", sexual or otherwise.