Sister-Mom

A sister who by blood is a sibling, but happens to play the role of Mother figure as well. (Sibling Co-Parenting)

This can occur for a variety of reasons such as cultural background, parents work schedules or simply having a large family.

Example 1: My sister-mom has helped me raise my grades, helped me focus on my future and is also my best friend.

Example 2: Teacher - "Hey, is that your mom over there? Is she picking you up from school today?"
Student: "Oh, no, that's my sister-mom."
Teacher: *confused look*
Student: "Well, she is my sister, but she also acts like my mom"

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sister fucker

a hillbilly

DuDE: look its a fucking sister fucker lets beat him up
Man: YEEEEEEAAAAAH

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Pisster Sister

When there is more than one sister, whoever is the pissest is the Pisster Sister, and the less pisster must therefore look after the Pisster Sister.

Sister 1: I'm SOOO wrecked!
Sister 2: Not as wrecked as me!
Sister 1: I SOOO am!
Sister 2: Okay.
Sister 1: Okay?
Sister 2: Okay.
Sister 1: Okay!
Sister 2: So, you're the pisster sister?
Sister 1: I'm th...(falls down, unconscious).
Sister 2: Yeah, ye'are (Sister 1 then proceeds to carry Sister 1 home).

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Sister Woman

A fond description of a woman from another woman with whom one feels connected; a chick who is straight up, cool, no catty bullshit.

"That chick would never steal my boyfriend. She is truly a sister woman!"

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Your sister

Someone doing ur sister

Billy: what are you doing?
Nate: your sister

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faggot sister

A highly offesive term used to describe your lesbian sister who hooks up with all the hot chicks you were trying slam. This is not your favorite sibling. Fucks with one's pride.

You think that the hot bicurious chick at the party would be a fun hook-up. Then your aggressive faggot sister intercepts and fucks it up for you.

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the zav sisters

only the hottest girls alive. one with curly hair and the other with straight. when they walk in the room everyone stops and stares but then quickly pretends not to. the brady sisters envy them and try to be like them but they can't even touch how these zav sisters are.

Kyle: Damn! The Zav Sisters are here! Time to get my freak on. *Sprays cologne*
Daniel: Fuck me! Fuck me!
Brady Sisters: *Drool*
Ethan: Yum, yum!
Jared: I melt.
Robert: HAY GIRLS!! Brady girls, stop drooling, you'll never be as hot as them.

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