A "gut feeling" refers to an instinctive, emotional sense or intuition about something, often without conscious reasoning or clear evidence. It's the feeling or hunch you get when making a decision or judgment, even if you can’t quite explain why. It's as if your body or subconscious is processing information and sending signals to your mind to help guide you. People might describe it as something you "feel in your gut" or a sense that something is "right" or "wrong" based on your instincts or experience, rather than logic or facts.