Wiktionary
n. (context US Mafia slang English) a member of the Mafia in another town or district, but not a direct rival
Usage examples of "friend of ours".
The Borgo Pass has held, and that freed an old friend of ours to look in on us from time to time.
But come, why must we talk of these sad things and frighten this young friend of ours?
He is no friend of ours, and the large man who seems half machine who went with the rest of our party to find help has devoted his life to finding and killing Josich.
I observed, that he might be easily introduced there by a common friend of ours, nearly related to the duke.
Mercald was a friend of ours, a priest, and he thoughtlessly laid hands upon it.
Lucien Debray is an old friend of ours, and private secretary to the Minister of the Interior.
On his first visit he won Tarek's confidence by representing himself as a friend of ours.