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sisterphobia 

sisterphobia example;
james: HI SISTERS!
normal human beings nowadays: ew ew ew ew ew disgusting!
sisterphobia by zayoon🤪 May 14, 2019

sleeve sisters 

Two girls who have slept with the same gent. Equivalent to the male version, Eskimo brothers.
Girl 1-"OMG, guess who i hooked up with last night? Sean."

Girl 2-"No way! i did too a few months ago!"

Girl 1-"I guess that makes us sleeve sisters."
sleeve sisters by shite87 August 25, 2011
sister-in-law; this is a way to refer to your SIL without having to call her 'sister'.

While in written communications one can use 'SIL', in spoken communication using the term 'silster' is both more descriptive and specific than saying 'sister-in-law'. And it's more concise as well, offering a savings of 50% (two syllables instead of four for 'sister-in-law'!

'Silster' is a useful term for those having trouble accepting the wife of their brother or the female sibling of their husband. It has a certain mouth-feel which reveals this reluctance and difficulty.
Somehow I survived a long weekend with my silster at the parents' place.
silster by skwerlgirl August 20, 2009
To be raped and made somebody's prison bitch. (ie Shawshank Redemption)

also sistering
So we when we went to jail Mike totally got sistered.
sistered by Chunkymonkey102 November 17, 2009

Ian you kiss your sisters cat with that mouth 

Ian you kiss your sisters cat with that mouth: It means when a guy like **Ian** Kisses a cat that belongs to his sister.
Dude 1: Ian you kiss your sisters cat with that mouth?

Ian: You know it!

Sistercest

having a realtionship or sexual relationship with your sister's ex
I can't believe my sister is fucking my ex. She's committing sistercest.
Sistercest by lexkatt December 2, 2010