half-sister-in-law 

Spouse's half-sister or half-brother's wife.

My half-sister-in-law is a good person.

half-sister-in-law by Rwopazaq November 24, 2019

co-sister-in-law 

The wife of one's spouse's brother.

My co-sister-in-law is a good person.

co-sister-in-law by Elivaldeq November 24, 2019

ur sister 

ur mom and ur dad fucking

ur sister was born

ur sister by ur mommmmmmmms a hoe January 16, 2020

ur sister 

it’s ur mom but for gays

Mark: ur mom
Jack: ur sister
Mark: kys

ur sister by zandingo January 27, 2020

Knife Sister 

A sexual act between two females in which each woman's ”Big Toe” is entered into the others vagina simultaneously As an act of camaraderie or partnership.

I heard those two were Knife sisters...

Knife Sister by Temptation Jones March 1, 2020

Ur sister 

A common comeback or a sexual joke made by people

I had fun last night

I had fun last night with ur sister

Ur sister by Jdhdhehe March 8, 2020

My sister in law 

Someone who’s a whore.

My sister in law married my brother. She is a whore, I bet she doesn’t know who their kids fathers are because let’s face it, she’s a nasty loosy whore hoodrat tramp.

My sister in law by Bawston69 August 10, 2020