BSF is a slang term that denotes a number of things. It is most frequently understood to be a shorter version of "Best Friend." Comparable to BF or other acronyms like BEZZA, BEZZER, BEZZIE, and BESTY, this is the phrase's most frequent usage. A true best friend is someone you can rely on for love and loyalty. When someone uses BSF in this context, they are highlighting how close they are to that individual.

BSF Meaning "Best Sister Friend." The phrase here describes a bond that is so strong and highly appreciated that the buddy is treated like a sister. It's important to remember that this term does not frequently include biological sisters. BSF can also be interpreted as "But Seriously Folks" in a more humorous sense. This is generally used to return the conversation to the original topic after it has deviated into humour or banter.

On numerous social networking platforms and messaging apps, such as TikTok, Facebook, Twitter, Instagram, Snapchat, and WhatsApp, BSF is frequently utilised. The meaning of "Best Friend" is notably prominent on these platforms as a result of the term being widely accepted and used among adults and teenagers. Because it is pronounced with each letter separately (i.e., "Bee Ess Eff"), BSF is an initialism abbreviation. Initialism abbreviations are distinct from acronyms, which are shouted-out abbreviated words (like LOL or NATO).