Getting someone to fuck off (leave), either by force or by berating them. The bracketed 'them' could be replaced by some other word; such as: "Fuck you off", "Fucked him off", "Fucked them off", et cetera.
Uses of 'Fuck (them) off':
1. ) Person 1: "Hey, what happened to Jack?"
Person 2: "Fucked him off. He rubbed me the wrong way."
Person 1: "Fair."
2. ) "My gang doesn't like outsiders, I might have to fuck you off for now."