I wouldn’t even know what that meant. But just the other day my Native American friend actually used the term “off the reservation”. But in all fairness he said the sentence, “When I moved off the reservation, I had issues keeping my status in the nation”, but of course a younger person in the conversation took offense. Not sure how you would talk about moving off the reservation without using those words.
we have an entire campaign work to correct exclusive language. You would be surprised how many expressions, idioms, etc., are pretty offensive when you actually look at them deeply. Some are actually drown right awful. As a kid, I heard them all an didn’t even think another thought about the actual meaning—even on the really bad ones. For example, the song “Eeny, meeny, miny, moe,” is among the worst.