1 definition by Callcp

Top Definition
Your sister, your only sister. She is your sister but a friend and the most amazing one at that.

First slurred out when I was drunk because there was no one word invented for her yet.

Sisterfriend is the best of both worlds: First she is your blood- Second she is your friend-confidant-reality check. Sometimes you fight and sometimes you get ridiculous with each other. She is a friend that will always be there because she has to- she's your sister duh!!!
I heart my sisterfriend so much but I'll slap that bitch if she borrows my clothes without asking again.
by Callcp February 26, 2012

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