sister suck 

To perform cunnilingus on another member of your sorority, typically as a friendly favor rather than a typical hookup or relationship

Sister 1: It's been too long since I've gotten laid, I wish someone would sister suck me.
Sister 2: I got this.

sister suck by trippletriangle April 25, 2015

sister suck 

Stranger: I used to have a ####### video of me licking a girl down there but it got deleted
Me: Ok...?
Stranger: that was my sister i did that to
Stranger: she asked me to do it so i did
Stranger: i stuck my tongue really deep in there
Me: Eww
Stranger: Not going to lie, it was great
Me: Ok

Sister suck is not allowed here c:

sister suck by TidePodIngebrigtsen69 March 31, 2017

my sister sucks 

your sister is not cool, is rude, and makes you want to kill yourself

my sister sucks. i want to leave

my sister sucks by charly6187 November 20, 2016

sisterfucker 

A husband or boyfriend that has female best friend that he says "she is like a sister to me". When in reality, he is cheating and is actually fucking the female friend.

John-doe is a lying Sisterfucker.

sisterfucker by Lulu the Phoenix October 2, 2021

Sisterfucker 

The male residents of Alabama

Sisterfucker. S-I-S-D-U-uh....-D-E-uh...R...fucker. Sisterfucker.
-Alabamian

Sisterfucker by Princess Amy's Peasant April 13, 2023

dick sucking sisters 

it is when 2 people suck the same dick/balls. so you become dick sucking sisters.

“omg did suck treys dick, me too, we r dick sucking sisters.”

dick sucking sisters by brookelovestrey June 8, 2022