Additionally, BSF Meaning "Best Sister Friend." In this context, the term refers to a connection that is so close-knit and valued that the friend is thought of as a sister. It's vital to note that biological sisters are not often included in this usage.
Finally, BSF can be read as "But Seriously Folks" in a lighter context. When the conversation has veered off into humour or banter, this is typically used to bring it back to the original subject.