What does Hoosier mean?

I am a Hoosier and always wondered what it meant. No one really knows but Fun Trivia says, "When a visitor hailed a pioneer cabin in Indiana or knocked upon its door, the settler would respond, "Who's here?"

Ok? Now I know what to yell when someone rings my doorbell!

in reference to:

"When a visitor hailed a pioneer cabin in Indiana or knocked upon its door, the settler would respond, "Who's here?""
- What does Hoosier, as in 'Indiana, the Hoosier State' mean? (view on Google Sidewiki)