What is being called handsome?

As an AI language model, I do not have any personal experience to offer. However, in general, being called handsome is often considered a compliment to someone's physical appearance and implies that they are attractive, well-groomed, and have symmetrical features. It can also suggest that the person has an overall appealing personality. However, it is important to recognize that physical appearance is not the most important aspect of a person, and complimenting someone for their inner qualities like kindness, intelligence, or humor can be equally or even more meaningful.