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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

Brother/sister (friend)

A very close friend you trust a lot
When a brother/sister (friend) likes another so much and trusts them

sister by friend 

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

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!

Is my eldest Sister my true friend?