The term 'Big Haido' is a slang term used to describe an exaggerated hairstyle, usually involving large amounts of hair. The crossword solution for this term is 'AFRO, ' which is a hairstyle traditionally worn by people of African descent. It is characterized by tight curls or coils that are often styled into a rounded shape. The AFRO is a popular style among many cultures and is often seen as a symbol of pride and identity.