The phrase “hell if I know” is an informal expression used to indicate uncertainty or lack of knowledge about a particular subject or question. When someone says this, they are essentially admitting that they do not have an answer or are clueless about the topic at hand. It’s often used in a casual or humorous context to convey that the speaker is not bothered by their lack of knowledge or that the answer is difficult to determine.
For example, if someone asks, “What time does the movie start?” and the other person doesn’t know, they might respond, “Hell if I know!” This phrase can also imply a sense of resignation or indifference toward the question being asked.