Rosboy is a term for a feminine boy or man. They consider themself a boy or have a connection to manhood, but they also have a connection to femininity, either in their gender or their gender expression. It is an umbrella term for all identities that involve being both a boy and feminine, and includes feminine aligned men and men who present femininely.
The female counterpart of rosboy is azurgirl.
The term rosboy and the flag were created by Tumblr user Neopronouns on July 17, 2020.