Sister slap 

When someone wants to slap someone but they’re too close to you so you don’t.

I want to sister slap my best friend but she’s my bestie so I can’t.

Sister slap by itchyboa January 24, 2019

Sister Stacey 

Is your sister is called Stacey ? She's probably a slut or stripper, you'll usually catch a slutty stacey at the docks giving heed to the fishermen.

Stacey's specialty is stinking eh fish and that's not from the fishermen it's cause she's a filthy animal who has the fattest minge on da planet

Sister Stacey is the fattest slut

Sister Stacey by Youma May 5, 2020

sister girl 

shes a firend and she loves it

hay maddy

hay sister girl cute shose

sister girl by cheekybitch May 30, 2020

Sister Sally

Sister Sally is the random man in a group who's duty is to wear the skirt and be the dumpster for the day. Generally approached from behind, the skirt is pulled over the bussy's head to hide his ugliness.

Story's vary over the origin of the name Sally, from pirate days taking turns in the barrel to desperate sister who would do anything for attention.

We usually call him Mark.

Me and the boys drew straws but I think you just like to volunteer to be sister Sally.

Sister Sally by JoeyKissyFace August 9, 2020

sister-chat 

A form of grotesque communication easily identifiable by a few key features: 1) involves a discussion between siblings, which usually includes at least one sister, 2) lacks any modicum of decorum, shame or refinement, and is particularly blunt or crass, and 3) typically includes discussions about sex.

Brother: Hey sis, my anus is leaking green mucus.
Sister: Could it be moldy cum?
Brother: Nope. I douched last night. Thanks for sister-chatting, but my hole bruns real bad.
Sister: Here's 10 bucks, go to the free clinic and get a scrip.

sister-chat by Annie Appleseed April 27, 2011

Sister Wives 

A group of women who work together in the same job capacity or share the same title.

There are five legal clerks in our division who are like my work sister wives and, thankfully, we all work well together and have a good time.

Sister Wives by peterpaulnmary November 29, 2017

Sister Bunny 

What you call the little sister, who is way too cute to be human.

Texting the sister bunny:

Big sissy: "Hey sister bunny! I'm off from school. I'm coming to pick you up now. Want to go shopping??? LOVE YA!!!!!"

Sister Bunny: It's all good; I'll just get mom to pick me up.

Sister Bunny by Smiley Bunny July 18, 2011