Sister Wife 

Best friend that is so close to you, she is like another wife your husband married. Husband may mistake her for his wife when she and wife are in the front seat of the car and said husband is in the back seat. Inflection and speech begin to mirror each other. Your kids may favor her over their own parents, and she treats them like they are her own! Not to be confused with sister from another mister.

My husband does not know who he is going to see first when he gets home, myself or my sister wife!

Sister Wife by gijoeswifey September 29, 2010

Sister wife 

A female lover of a woman who is already married their partner. And the partner is totally cool with it and gets in on the action every once in a while, but the female lover is purely in the relationship romanticly with the woman married to the partner. In some instances the female lover is romanticly involved with the married partner as well as the original female. This could also work with two male partners and the female lover is included in the same way as discribed above.

My husband joined in while my sister wife and I were making love.

Sister wife by The12thFaerie November 2, 2017

Sister Wife

a biological sister whom is your wife, girlfriend or lover. Typically seen amongst white southern rural Americans.

Spud: bi ie be bickie bo boobie cletus I swear to god if you done looked at my johnny rebel album record collection!

Cletus: Oh I did more than just look!

Spud: Bie ei ouh bickie bi bo boobie! Cletus I swear to god if you done TOUCHED my Johnny Rebel album record collection! Thats the closest damn thing I have to a sister wife!

Sister Wife by Bassnium.exe December 29, 2025

sister-wife

A female (family member/friend), who is a sister (or like a sister), who helps (usually another female) frequently with cleaning, cooking, childcare, other household duties, etc.

There is no romantic involvement with a sister-wife or her spouse, however she is beloved by the whole family.

Heather is always helping me cook, bake, clean and my children love her too! She is my sister-wife!

sister-wife by Martha2010 November 23, 2009

queen bitch sister wife 

A queen bitch sister wife or QBSW for short is someone who knows what they want and GETS IT, they rule over all of the other sister wives and even has a couple guys on the side

In a sentence: damn that girl stole my man again her twerk game is too strong. I wish I could be a QUeen bitch sister wife like er

queen bitch sister wife by Doooooit October 7, 2013

Step-Sister-Wife 

A wife's husband's "other woman" known to the wife; whether openly acknowledged or not.

The legal wife of a woman's, generally a mistress, long-term boyfriend/lover/mate.

Two or more women who share a romantic relationship with one man, but do not share a dwelling/residence.

After spending 25 years with me and simultaneously spending 18 years with her, she was more like a step-sister-wife than my husband's mistress.

Since Warren Buffett never divorced his wife Susie, she and his long-term partner, Astrid, are, for all intents and purposes, step-sister-wives.

Step-Sister-Wife by AmberChella March 17, 2011

Roof or Sister Wife 

a rating system for stories you are about to tell. You got a new roof on your house is totally boring, but you got a sister wife is worth stopping everything to hear about.

Is this story going to be "roof or Sister wife" 'cause I'm really busy

Roof or Sister Wife by Pig granny January 20, 2011