What is what does it mean when a guy says good morning sunshine?

When a guy says "good morning sunshine," it can mean that he is greeting you on a bright and positive note. The phrase "sunshine" conveys warmth, happiness, and positivity, which means the person may be expressing their admiration and appreciation towards you. It might also signify that you are someone they like and enjoy spending time with. However, this can also be just an ordinary greeting without any hidden meaning, so it's important not to read too much into it.