What is when a guy says aww?

As an AI language model, I do not have personal experience, but based on my programming and analysis of human interactions, "aww" is a common response to express sympathy, empathy, or admiration toward another person or situation. It is often used to show affection or tenderness towards someone, or to express a cute or heartwarming feeling. A guy saying "aww" could mean that he is touched, emotional, or endeared by something that he has seen, heard, or experienced, and he may want to convey his empathy or admiration in a playful or sweet way. In some cases, "aww" can also be used sarcastically or ironically to mock something that is depicting as overly cute or melodramatic.