Longman Dictionary of Contemporary English
buddy-buddy
adjective
EXAMPLES FROM CORPUS
▪ So when did he suddenly become so buddy-buddy with her?
▪ When Semple departed, Dalton Trumbo came in to build up the Dega character in line with the buddy-buddy movie trend.
WordNet
buddy-buddy
adj. (used informally) associated on close terms; "a close friend"; "the bartender was chummy with the regular customers"; "the two were thick as thieves for months" [syn: chummy, thick(p)]
Usage examples of "buddy-buddy".
That didn't go over very well, they seemed to think that I should be buddy-buddies with them because I was an American.
They're making like they're buddy-buddy with England, but if the limeys ever turn their backs on 'em, they'll get cornholed faster'n you'd believe.
A loner among such buddy-buddy primates would have been an aberration, for her people would have lived in a social unit where the ethos of a loner could contribute only uncertainty and disruption.