Green’s Dictionary of Slang

(Aus./US) friendly.

1957		D. Niland Call Me When the Cross Turns Over (1958) 196: That’s why I’ll grubstake anybody till they get on their feet. You’ve got to give a buddy man a fair go.
1967		M. Braly On the Yard (2002) 343: The question [...] reminded Red of the interrogatory technique of the kind of detective who came on buddy-buddy. Red shook his head amiably, just as he would have for the buddy detective.