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BSF

best sex friend best friend you have sex with

Alt night was great I hung out with my bsf ;)

by Yhnhjk September 5, 2022


BSF

BallSack Factor
The BallSack Factor is calculated by the difference in the height of your balls divided by the length of your lowest hanging ball. The difference of the balls is measured from the center point of the upper and lower ball. The length is determined by measuring the distance between the base of the ball sack to the lowest point of the ball sack.

BSF = Δballsack / ℓ ballsack

How is your BSF doing? Are you hitting double digits yet?
Almost! My BSF was around 9.7 this morning, what about yours?
No way bro! My BSF was only 0.5 :(

by Monsieur Ballzaque February 13, 2023


the bsf combo

when 2-3 people like/liked you and they're all bestfriends (pronounced b-s-f, meaning: best friend).

person 1: "hey I heard that Jake and dave like you alongside with john!"

person 2: "looks like I got the bsf combo!

by ur.mom_ November 25, 2021


Embarrass your bsf day

On the 17th on June is embarrass you bsf day where you get to post or expose cute or funny photos of them

Oh hi today is embarrass your bsf day enjoy it

by zazaisswag June 17, 2022


National bsf day

You have to become bsf with one person

Go up and ask to be there bsf happy national bsf day

by Bsf4ever September 24, 2019


National Bsf Day

National Bsf day is on November 6 show off your bestie.

“Are you busy on the 6?”
“Yeah”
“Doing what?”

“Celebrating national Bsf day , with your no having Bestfriend ass”

by freak man yeah thats me. November 1, 2021


Bsf goals

Private story of your bsfs and how close y’all are post pictures/edits etc.

Bsf goalshow close y’all are and how munch you love them

by Lulbaby223 March 15, 2020