Means Big Turkey, in plain English.

Her father, old Chief Big Turkey, adopted me into the tribe, and they call me by his name.

Annie-Many-Ponies has heard it used ever since she was a kid.

By tribal law I'm her brother.

Well, what's the word, boys?
Shall we let her stay or not?
We could use her, all right, and put a dash of old-plains' color in the picture that I haven't got, as it stands.