It is used to define a girl who is a friend. So when a guy introduces a girl as his friend, he can just say that she's a girl-friend and not make others think about ship names at that instance itself.
Mom: Ooh who's Sarah?
Boy: Mom, she's my girl-friend, she's more like a dude than a girl so shhhh.
by baboushka124 May 4, 2021
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When you’re a girl, your girl best friend is a female best friend that you also make out with. It is usually used when the parties involved do not want others to know.
Clueless person: Why do you and Mia spend so much time together?

Secret lesbian: Oh, we’re just girl best friends
by cool rats February 4, 2021
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A girl that you can tell anything to and she will just listen…. A girl that will comfort you when you’re sad… a girl that will cuddle you like a big brother or hold you like a little brother. A girl who is always there for you when you’re lonely, need her or don’t. she is something that you don’t wanna lose. she’s trustworthy and honest. no matter what you did she texts you goodnight or good morning. she loves and cherishes you when you don’t know it, she’s always what you want in a person to be with you forever. she’s almost like your sister and you treat her like a princess and she treats you with upmost respect.
A girl best friend … someone you need in your life
by emilyybooxxo January 7, 2023
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The girl best friend will always wonder why you chose another girl when she was the one always there for you.
A: Wait your dating ____? I thought it would have been ____.

B: Yeah but she’s just my girl best friend.

A: Bro she loves you tho

B: Maybe I’m blind to things that good for me

A: Yeah you’re dumb.
by Thegirlbestfriend September 10, 2020
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A girl best friend will always be there for you no matter what anytime and will make fun of you ALL THE TIME and be mean to you but it’s just because she is comfortable with you because she would never to do that to anyone else but will always stand up for you and is the only one allowed to talk smack about you. She is also the person who will help you with girls and give you advice. A girl best friend will also never lie to you, tell you when you’re wrong, and people will always think you’re more than friend. You go to her for style choices and anything you need help with.
someone: you’re like really close to that girl are y’all a thing?
boy best friend: Nah she’s my girl best friend.
by ur bestieee December 28, 2021
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