Kanacks are what turkish "gangsta" people are in Germany. It's comparable with "nigga" in the English. They mostly hang with their turkish friends and dress themselves in a matchable way. Kanacke means actually "Human"
Alter ich wär der einzige Kanacke in diesem Club! Ich geh da nich rein!
would mean: Bro I'd be the only kanack in this club. I ain't going inside!