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

BSF by Your_Dictionary April 14, 2019

BSF 

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 :)

BSF by foreveryounnng October 21, 2012

Bsf 

When someone uses “Bsf” in a text, it usually means bestfriend.

Girl 1: Heyyy Bsf

Girl 2: Hey, hows it goin bsf?

Bsf by RugRat-47 June 16, 2018

BSF 

Best friend

You want to fight bsf

BSF by Kiahhh February 24, 2018

Bsf 

Bull shit friend

Basically an acquaintance

T : you’re my bsf
I : best friend?!
T: no, bull shit friend

Bsf by T&I June 25, 2018

BSF 

How low do you hang?
Ball Sag Factor

How's the BSF today?

BSF by FactRzerO August 1, 2003

BSF 

"Bull Shit Foursome"
Four friends who often go out together on random crazy adventures and day trips.

Let's go out BSFing this weekend!

BSF by Cindy5 January 24, 2009