1. Mr.; Sir: a Spanish title prefixed to a man's given name (initial capital letter).
2. a lord or gentleman (in Spanish-speaking countries).
3. an Italian title of address, esp. for a priest (initial capital letter).
4. a person of great importance.
5. a head of a family or syndicate (in the Mafia).
6. The true baller of the crew; a generous man characterized by nobility and forbearance in thought or behavior; magnanimous, who does it big and is givin respect when he treats his boys.