The phrase "good mood" refers to a positive emotional state or disposition. When someone is in a good mood, they are feeling happy, content and cheerful. They may be more relaxed and at ease, and have an overall sense of well-being. A good mood can result from something as simple as waking up on the right side of bed, receiving positive news or experiencing a pleasant event. It is generally associated with feelings of optimism, hopefulness, and enthusiasm.