sister

a person that is your best friend and is your enemy. a person that will always have your back whether you're related or not. a person that you live up too and love no matter what comes your way.

Lisa is my sister from gymnastics
Rachel is my twin sister that gets us in trouble

by smexaymama June 21, 2019

Male Sister

A brother who acts more sisterly towards his siblings, i.e. never fights with his siblings, always is nice to them, doesn’t bicker with them, etc.

Friend 1: Have you been to the Wilson’s house? I swear those kids never fight.

Friend 2: Yeah, you’re right. I’ve never heard Eli Wilson say an unkind word to his sisters.

Friend 1: He acts more like their sister than their brother tbh

Friend 2: Fr. He’s almost like a Male Sister.

by randomopc February 21, 2024

Sister-Cousin

Your female cousin whom you are so close with that your relationship reminds you of a loving pair of sisters.

That’s not just my cousin. That is my sister-cousin.

by John Jacob Allen Smith March 5, 2024

boob sister

when you and your friend are wearing the same top or the same color by mistake, you’re boob sisters

oh, look we are wearing the same top…
-I know, we are boob sisters now.

a boob sister is when you and your friend are matching tops by mistake !

by lululune May 9, 2023

sister fucker

Someone who is extremely based.

"Man, that guy is so cool. He has got to be a sister fucker."

by treehugger_ September 21, 2025

The sacred sister law

The sacred sister law states that “If you find news or information that makes you feel uncomfortable, you must share it to your sister”.

The sacred sister law: Brit and char are sisters. Brit found a video about an onion that made her feel uncomfortable. Brit shared the video to Char.

by Shhhitsbrit November 21, 2022

ur sister a mister

The absolute killer of 'ur mom gay' 'ur dad lesbian' 'ur granny a tranny' and 'your grandpap a trap'.

Henry: Don't make do it.
Joe: Do it pussy.
Henry: Ur grandpap a trap.
Joe: Bitch please.
Joe: Ur sister a mister.
*Henry's body turns into dust*

by LoCaboose March 13, 2018