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 :)

by foreveryounnng May 12, 2012

BSF

Best friend

You want to fight bsf

by Kiahhh February 24, 2018

BSF

How low do you hang?
Ball Sag Factor

How's the BSF today?

by FactRzerO August 02, 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!

by Cindy5 January 24, 2009

BSF

The cliched phrase every guy tells to a girl when he wants her: Beautiful, Smart, and Funny.

Hey bro, did she say yes?
Nah, I did the BSF way too early

by Kukoo October 10, 2010

BSF

Someone who is a BOOB STARING FREAK. Usually straight guys.

"oh my gosh that chick has got a nice rack!"
"YOU BSF!"

by CoolerThanYou32197392183 January 23, 2009

BSF

BSF - Best Skype Friend

When you have a best friend, who is on skype.

This could change if you have a better friend on Facebook or MSN

BSF is only related to Skype

Ryan is my BSF. I enjoy sending him poems.

Ben is not a good BSF he talks to other people on skype more than me.

Ben - Hey will you be my BSF?

Travis - No how could you say that? I already have one!

by TheRealWord January 13, 2011