Green’s Dictionary of Slang

1. a friend.

1992

A. Duff One Night Out Stealing 150: Think I should buy a round of drinks, Bill? [...] Man, why’d you do that? They got bread. We ain’t coon gangies here.

2. a fellow gang member.

2002

A. Duff Jake’s Long Shadow 72: The entire floor of this wing is full of your gang only, non-gangies floor above and floor below scared of us, they’re our subjects in our gangdom.

3. see gangie n.