BSF

A Back Stabbing Friend

Caroline was a BSF cause she lied to make the team

by Brynn the girl who was stabed March 15, 2019

BSF

Boston Sports Fan
Someone who cheers for the Patriots, Celtics, Bruins, and Red Sox either by choice or by default (someone who is originally from Boston or has lived in Boston at one point in time).

"You're not watching the Patriots? Just because you're in New York doesn't mean you can abandon your BSF duties."

by Gildey October 25, 2015

boy bsf

Really close friend that is a boy. Almost as if they are siblings.

I really want a boy bsf

by Miley Sasher September 30, 2017

Boy bsf

A boy bsf is someone that will treat you like a sibling but less mean. They will bring you food and give you hugs and cuddle you but it’s all platonic. If you have a boy bsf you are lucky

Girl 1: bro last night Jake brought me ice cream because I was sad, he’s a real boy bsf

Girl 2: LUCKY!! I need a boy bsf

by Ashfern February 22, 2019

bsf rebound

person whose being used by their best friend because they don’t have a bf/gf

person 1) i feel like kelly only really talks to me when she’s single
person 2) she’s found her bsf rebound ig

by hottestmilfoat January 20, 2023

bsf bc

bsf= bestfriends

bc=brother crush

so this basically means that you have a crush on your best friends older or younger brother...

woah you have a bsf bc
yeah...
you should tell your bsf

by brook;)) October 22, 2020

girl bsf

Very close friends. Almost if they were siblings.

I want a girl bsf

by JD_EX3 July 05, 2018