‘No skin off my back’ is an expression used to indicate that something doesn’t affect or concern someone at all. When a person says this phrase, they’re usually implying that they are indifferent to a situation or decision, and it won’t cause them any trouble or inconvenience.
This idiom often comes up in conversations where someone is explaining that they don’t mind a particular issue or that what happens won’t have any significant impact on them. For example, if a friend decides to pursue a career that you think is not ideal, you might say, ‘That’s no skin off my back,’ meaning you’re fine with their choice and it doesn’t bother you.
The origin of the phrase is somewhat unclear, but it’s generally understood to emphasize the idea that the speaker isn’t experiencing any discomfort or detriment from the situation at hand. It highlights a sense of detachment or lack of personal stake in the matter.