Also this can be used as a verb. The act of Luthering would be to fuck a man's wife or girlfriend while he is at work, preferably in his home. This act could come at a high cost because the chance is always there for a walk-in of the husband which will almost always lead to death.
Luther, He's in the buisness of fuckin your old lady.
Yeah, thats pretty sweet that kid is Luthering it up pretty well with Joe's old lady.