a person who gives up all material things and becomes spiritually devoted to himself. Many sadhu's can be found in India. Sadhu is also a unique name that is uncommon for many parts of the world, i.e. America.
1) - When I went to India last summer, I stayed with a tribe of sadhu's to see their way of life.
2) - Guy#1: "What's that kid's name?"
- Guy#2: "Sadhu"
- Guy#1: "That's a wise ass kid"