Green’s Dictionary of Slang

fuck about v.

also fuck around, fuck round
[fig. use of fuck v. (1) + SE about/around]

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.