Something bad happened, someone is going to get blamed and suffer the consequences of the act. Righteously, it should be the person who planned it, but, everything is negotiable. Someone else goes to jail, and in return, he is owed a favor. Or maybe, he just gets set up. This 1940's film noir gangster term is finding a new cachet.
You shot him brother so don't look at me like that. I'm not gonna take the fall for you.