Green’s Dictionary of Slang

fuck-off n.

[fuck off v.]

1. [1940s+] (also fug-off) a lazy or inefficient person, who prefers to fuck off rather than work.

2. [1950s] a despicable thing.

3. [1980s+] a gesture of contempt.

4. [1980s+] a statement of prohibition.

5. [1980s+] an irritating or frustrating situation.