A fork of Rural Dictionary
Best slutty friend- The friend of an ex-slut has from her 'wild years', who unashamedly knows all of her dirty secrets, and more often than not was present for some of them. The BSF will of course have shared at least one, if not two (and sometimes at the same time) boyfriends or lovers of the subject. Whilst the subject does her best to hide her past the BSF loves nothing better than to loudly discuss her current and future sexual conquests in front of anyone who will hear. The BSF of course must naturally do her best to either break her friends relationship so she can bring her back into the slutty fold, or be apathetic about a break up and never encourager her friend to actually try and make something of her life.
Sally and Angie had been friends for years, So sally invited Angie to her wedding. Angie then screwed sallys husband and two of the grooms that night, Angie asked why she did it, she said I am your BSF!
A bsf means best friend usually, bsf can mean a best friend who is like a sibling to you or just a best friend
Hey bsf how are you 2day
Best sister/friends When two best friends are so close that they consider themselves as sisters !
- Pauline and Catherine are really close! - Yeah! They're BSF s :)
Bull shit friend Basically an acquaintance
T : you’re my bsf I : best friend?! T: no, bull shit friend