Sister Twister 

When you put your dick in your girls ass, and proceed to spin her like a helicopter blade. Doesn't have to be your sister, but it can be. Works best with small girls as they are easier to spin.

I had a dream last night me and Mila were doing the sister twister when my dad walked in.

Sister Twister by BigOlBeanBoy June 16, 2018

Sister Mary

a slang term for marijuana

Jonhnny: Can I have some of that Sister Mary?
Timmy: It's $10 a gram, come back when you have the cash.

Sister Mary by bobert93 July 3, 2009

sister-cousin 

a sister-cousin is when your baby's daddy has a child with your sister-- your baby and her baby are sister-cousins.

"im going to the movies tonight with my sister-cousin"

sister-cousin by scrapwebb January 6, 2012

sister fister

The act of fisting your sister. Commonly refered to as incest.

Yo this kid named Nicholas O. is a fucking sister fister!!

sister fister by Dankolas O. January 25, 2016

sister ass kiss 

being nice to your sister (preferably one close to your age) in hope of hooking-up with one of her friends

joe-"why are you being so nice to your sister?"
bob-"oh, i am sister ass kissing"

sister ass kiss by soejoto February 1, 2009

Sister'ing

A time in a women's life characterized by her open heart and ability to love and support other women; accepting and protecting them as sisters.

Chelly Rey has inspired women through motivational speaking that sister'ing is necessary in our every day life.

Sister'ing by Chelly Rey June 30, 2018

Sister fucker

95% of the people that don't live in a city

Not all truck drivers are sister fuckers but all sister fuckers are truck drivers

Sister fucker by treeman7 June 9, 2018