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"

Sister-Mom by WordWatch January 20, 2018

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sister-mom

When someone's mom looks so young she could be their sister.

Jenny is coming to the party and she is bringing her sister-mom. I saw Chris shopping with his sister-mom.

sister-mom by jillyjillz May 2, 2011

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Sister-mom

When your dad has sex with a woman and said woman has a girl for a child. Then the dad fucks the daughter and you are born. Motha fuckin sista mom

guy #1 "Dude your mom is hot"
guy #2 "That's my sister"
guy #1 "Oh shit, you got a sister-mom"

Sister-mom by zeilgarsiulgfiSDoiuSEibugsEigu February 24, 2012

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Sister Mom

A mother to one or more children with a best friend who may or may not also have children. They do not live together but can call on each other at any given point to step in. They have complete confidence that other mom will do as great or better as they can.

"Her sister mom picked up the children and took the kids to practice while she was stuck at work"

Sister Mom by MomInDe May 9, 2022