Best friend-in-law 

The odd occurence that when you are going out with someone you inherit their best friend as one of your own good friends. Often occurs more that a girl will become very close to her boyfriends best mate than the other way round.

"You and Johnny are such good friends How do you even know him?"
"Oh Hes Toms best mate so hes my Best friend-in-law"

Best friend-in-law by WooBlackbetty December 9, 2008

Best friend material

Someone who is amazing , and funny and is always there for you , no matter what

Emilee T . Is best friend material .

Best friend material by Idontknoworcare December 3, 2016

best-friend-gayle 

BFG stands for Best Friend Gayle
A spin on Oprah's infamous reference to her friend Gayle King. Whenever she mentions Gayle, she doesn't merely say "Gayle" she always says "best-friend-gayle."

Use this phrase to describe any same-sex best friend.

This works especially well when introducing a friend who is ONLY a friend, but often mistaken for a lover.

Can also be shortened to BFG.

Hi, I'm Steve. This is my best-friend-gayle, Mike. We've known each other a long time.

People think we're together, but we're not. She's is my best-friend-gayle.

You're more than my BFF, you're my BFG!

best-friend-gayle by gmcqueen June 19, 2017

best friend law 

If this law is called between two people that have agreed they are best friends then the person that calls the law is in a family related, relationship related, love related, school-related, or social related situation. After this law has been called the the opposite person of the one that called the law must help the caller until he/she says the name "Tim McGraw".

I called the best friend law whenever I broke up with my girlfriend.

best friend law by George strait and Jones May 31, 2019

Best friend story 

a bestfriend story- where you talk about how good he/she is to you , how you explain yall bond

who tryna be added in the best friend story where i talk bout my bestie

Best friend story by mermaid102 February 24, 2020

Best Friend Valentine 

It’s not bad to have a best friend as your valentine so it’s Best Friend Valentines! They could be single or taken, who fucking cared? Ask them to be your best friend valentine, it’s honestly the best.

“Hey, wanna be my best friend Valentine?”

Yo, I asked my best friend to be my Best Friend Valentine.

Best Friend Valentine by Stockyy January 30, 2021

Best Friend Joel 

Best Friend Joel is a nickname for a guy named Joel who is almost everyones best friend. But he might not like to be called this it is still fun to say

Joel: Hey guys how you doing
Person: Hey Best Friend Joel
Person 2: Best Friend Joel!

Best Friend Joel by Scaryturryman March 23, 2018