BSBF 

Bi Straight Best Friend

When you have a friend that's not gay but bi and if you straight you become their straight friend.

Everyone needs a bi friend except me, I'm the one who's the bi friend. Yesss, so im your straight friend. We're BSBF

BSBF by ChampagneMana May 24, 2017

BSBFL 

Best Stupid Budies For Life!
only the best of friends who enjoy laughing at eachother's stupid mistakes or tendencies.

example:

Gina: OMG! Today I was riding my bike and the chain fell off!
I didn't know what the hell to do?

Roberto: Haha! My BSBFL, I wouldn't either!

BSBFL by Pier21Imports July 13, 2010

BS BF 

when you pity date a guy that you show no interest in and/or don’t have feelings for. (stands for bullshit boyfriend)

Ah jeez, another BS BF? Please stop, Barbara.

BS BF by jillwhoneedstochill January 28, 2018