Sister friend 

A friend who is like a sister.

I love how my sister friend is supportive.

Sister friend by Rachaelschulman May 12, 2018

sister friend 

A person who is always there for you. Similar to a best friend but more, someone you hope will be in your life forever, she will be in your wedding and you two know eachother like sisters would.
Not developed with time, a person you meet and just know they are your sister friend.

I miss my sister friend, but physical distance can't keep us apart.

sister friend by BabyK87 February 25, 2010

sister-friend 

Your bestesting friend. Better than any friend. Who's been your friend for so long you might as well be sisters. You hate her you love her. She's your sister.

I have to make my sister-friend my maid of honor at my wedding or she'll kill me!

sister-friend by Dancingmelissa September 6, 2005

Brother/sister (friend)

A very close friend you trust a lot

When a brother/sister (friend) likes another so much and trusts them

Brother/sister (friend) by MasterOfStats January 1, 2019

sister by friend 

A sister by friend is the wife of your brother from another mother.

Suz is my sister by friend as she is married to my brother from another mother Jonathan, said Josh.

sister by friend by J2S-PewPewPew March 12, 2014

your best friend's sister 

a stupid comeback phrase that's used for virtually everything, even if it doesn't make any sense whatsoever

Friend #1: dude! i saw your mom last night! she was hot!
Friend #2: your best friend's sister!
Friend #!: you have a sister!?

dude: what happened last night!?
dude 2: your best friend's sister!
dude: shut up!

your best friend's sister by dawg69 June 21, 2009

Is my eldest Sister my true friend?

Is my eldest Sister my true friend?

Is my eldest Sister my true friend?

Is my eldest Sister my true friend? by sdinaz October 23, 2023