BSB

Means (B)itch (S)ince (B)irth

Makayla Yoo so fine

BSB fashoo

by BitchSinceBirth March 30, 2020

BSB Special

To cave ones date in. Bumsex.

Michael asked lez if she wanted to receive a bsb special.

by Flying bum September 25, 2020

BSB

When someone has transcended the relationship status of a best friend, and are now a backseat buddy.

Holy hell, I think they're BSBs for LIFE!
No Way!

by HAIM8 January 1, 2024

Bsb

Back Seat Boyz

All of us are BSB’s.

by maimai2000 November 5, 2020

Bsb

Bestie since birth. Someone u have known since birth or for as long as u can remember. U have always been there for each other and always will be. Can be boy and boy, boy and girl, or girl and girl

Girl #1: ugh I miss jack, he’s my bsb, can’t believe he had to move away

Girl#2: girl I may have not known u since birth but honey I will be here for u

by Happyhour101 August 20, 2018

bsb

big stinky baby

dude. by the way your acting rn, ur being a bsb.

by bigstinkybaby September 26, 2021

BSB

BSB means Big Steppa business. Which means you’re all about your business and no one is on your level

Julian got his bag up,He must be about his BSB

by BSRo February 7, 2022