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From more Googling, I've learned that some people think the off in "where do you get off" could possibly be a phonetic сокращение (contraction) for "all of that stuff" ("stuff" here = "nonsense",...

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...

As to the actual origins of the phrase "where do you get off...?", I'd point out that, first, the idiom is essentially identical in meaning and usage to "Who do you think you are, to do...

Hmmm... doesn't really answer the "where'd you get off" question, but I suggest that in the example given by kidkboom, Man 2's "where" really means у кого, not где or как.