Bsgf 

“best girlfriend”. me and my best friend met an old woman at her antique jewelry store & while shopping around she told us “there will be a time for a boy. But that boy can tend to change. So you need a best girlfriend. That you’ll always have”
used girl to girl
not by a boyfriend
like ride or die/fo lifas/bff/soulmate

me and my bsgf are going out. me and my bsgf have been close since we were kids.

Bsgf by Ana Kwon September 12, 2021

BSGF Bomb

BSGF Bomb(BullShitGirlFriend) : the act of saying you have a girlfriend to get someone else to stop calling / instant messaging you

"After being polite to a single serving friend last month, she wouldn't stop calling me so i decided i had to drop a BSGF bomb on her last night."

BSGF Bomb by tommy gee June 26, 2008