Green’s Dictionary of Slang

buddy-fuck v.2

[buddy n. + fuck v. (1)]

(US gay) to have intercourse with a friend rather than a lover.

Treasure Island Media video catalogue 🌐 Knocked Up [...] Steve Parker truly enjoys Billy’s beautiful wide-open ass [...] and he has to keep pulling out before he shoots too fast. He and Jeremy buddy-fuck Billy one after the other, and then they team up and double-fuck him.