fuck about v.
1. [1910s+] to mess about, to waste time, to fool around (with).
2. [1920s+] to annoy someone, to inconvenience, to waste someone’s time.
3. [1960s+] to wander about aimlessly.
4. [1960s+] to have sex outside one’s primary relationship.
5. (US Und.) to commit a crime.