The definition of a cobber is Australian slang for a friend.
An example of a cobber is someone a person has been close to his whole life.
Austral., Slang a close companion; comrade
Origin of cobberprobably from Classical Hebrew (language) (via Yiddish) chaver, comrade
A pal; a buddy.
Origin of cobberPossibly from dialectal cob to take a liking to