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1. rude slang Go away. Fuck off, will you? I don't want to hear any more of your ridiculous conspiracy theories.
2. rude slang To engage in aimless recreation or frivolous time-wasting; to fool around. I can't believe we spent the whole day just fucking off.
3. rude slang To masturbate. A: "Why is he all embarrassed today?" B: "Oh, his crush walked in on him fucking off. How horrifying is that?"
rude slang Very angry. Of course I'm fucked off—she lied about me to the boss!