Green’s Dictionary of Slang

1. a sexual partner, but not a steady lover.

2002

Allecto ‘Buddy Fuck’ 🌐 He smiled softly, and kissed Wade on the cheek. ‘You,’ he said, ‘are the best buddy fuck I’ve had in ages.’.

2. an act of hedonistic, non-committed sex.

2001

C. Nelson Il Traviato 14 Apr. 🌐 Sure, Krycek was his partner, but they could handle this. It was just a buddy-fuck, nothing to get upset about.