The acronym BFF has multiple meanings that depend on the context in which this slang word is used. Erica Swallow, a writer for Mashable, states that BFF stand for Best Friends Forever, Binary File Format or Ben Folds Five.
Best Friends Forever is the most well-known meaning for the shortened BFF, primarily because of texting and chatting revolutions. However, a computer programmer from the 1980s and 1990s remembers BFF as an acronym for Binary File Format: a way of storing computer information coded in binary. Also, BFF can refer to the musical act Ben Folds Five, a piano rock band that gained popularity in the 1990s.