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Sister-in-law 

The ultra important, high falutin, and just all around annoying sister of your spouse. She will not be at your wedding because she has more important things to do, and if by chance she shows up, she'll ruin it. She's your mother-in-law's teammate and soldier.
The ideal sister-in-law is one that resides six feet below the ground in a cemetery, right next to the ideal mother-in-law.

sister daddy 

When a cross-dressing man sees himself as a father figure to a girl roughly his age, such that they could be sisters.
I met this billionaire the other day and he offered to be my daddy. But he was wearing a cocktail dress and looked like he could be my sister. So he’s my sister daddy <3 I asked him to marry me but he said no
sister daddy by Lux_painted March 27, 2021

sister fister

when you have incestuous thought and want to fuck your sister
kristian:i want to be a sister fister
kevin: dude no

sister finger afu 

someone who has regretted marrying and who gets mad at anything. tries to be the older sibling when she knows she isnt. always gets bullied for her indian accent. siTueSUN. a good finger afu tho. ALSO HATES SAKI. calls a human pumpkin.
but sister finger afu no UwU
sister finger afu by saibo September 16, 2021

sister-in-law 

1- Sibling's wife.
2- Spouse's sister.
My sister-in-law is a good person.
sister-in-law by Wonbig October 13, 2021

Sister Fister the mister kisser 

My dad is a sister Fister the mister kisser