Similar to cowboy, this is when a man is a true prize catch in a relationship. It is like he is a prince if not a king to his partner, hence he is a Crownboy.
Mike is the greatest man I could ever ask for. I literally love him more than anything. He does everything for me to make sure I have the best life possible and makes me feel like royalty. He is my prince and he truly is my Crownboy.