Surfer Sisters 

When you and your friend realize you have both had sex on the same bed or in the same bedroom, but each of your sexual conquests occurred at different times.

"You hooked up on Katie's futon too?!"
"Yeah, last year. Oh that makes us surfer sisters!"

Surfer Sisters by P3nis Fly Trap May 19, 2015

Freak a leek sisters! 

Girls who are very close and will do anything together even though they are not dating/in some sort of relationship.

Tony: Jake, what are you doing later on tonight?

Jake: I'm hanging out with Jelly Bean and Nanc-izzle.

Tony: Nice bro!

Jake: I know right?! dude, they are total Freak a leek sisters!

Freak a leek sisters! by Snake65652525 March 20, 2010

sistromance 

noun.

A close but non-sexual relationship between two women, a form of homo-social intimacy.

The female equivalent of "bromance".

"Did you see those two kissing? Are they lesbians?"

- "Na, it's just a sistromance."

sistromance by Sheila Jane November 3, 2009

syster 

swedish for sister ie totally amazing female who will always be there for you no matter what.

syster saved my life!

syster by perfectly.im.perfect August 10, 2016

ya-ya'ing the sisterhood 

A way to describe a female masturbating by rubbing her clitoris.

Yo, I walked in on my sister and caught her ya-ya'ing the sisterhood!

ya-ya'ing the sisterhood by KDaddy923 September 18, 2006

Sisterfriend

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.

Sisterfriend by Callcp May 14, 2012

shister 

def1.Girls in a friend group who act like they practically live together and cant ever be separated and have seen the worst of each other;since they arent actuly sisters they call themselfs shisters
def2.A veiwer of James Charles

girl 1 Hey shister

girl 2 hey boo boo

shister by school.sukks October 20, 2018