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Ur sister is a mister 

An insult meaning that your sister is actually a transgender man. This insult is so rare it has only been said by 4 people and was buried in the Egyptian pyramids to never see the light of day.
Guy: ur mum gay
You take out a golden box
Guy: Holy fuck hold on man I was just joking please don’t do this
You: Ur sister is a MISTER
World explodes

Bonus Sister 

Same relation as a stepsister, but with positive connotations as opposed to the negativity that is typically associated with a Stepfamily. Bonus family members are chosen freely and they enrich your life.
My mother remarried after I moved out of the house. I am a good friend with her new husband. As an added bonus, I was introduced to an awesome new awesome friend: my Bonus Sister.
Bonus Sister by DieDirk May 14, 2016

best sister ever

Someone whom is your sister or someone who resembles a sister, that will always have your back and is your bestfriend at the same time
best sister ever by Momma cat August 27, 2017

Step sister 

sis are parents are home we should stop

you ok meet me inside the shower

sis ok see you there
you hey step sister our parents aren’t home yet let’s fuck in the shower

sis ok sounds fun
Step sister by Taboo topics February 1, 2018

Ur sister a mister 

A very dangerous phrase, not to be used lightly. Has risen from other primitive phrases such as ur mom gay, and ur daddy lesbian.
Carl: Ur mom gay
Dylan: ur granny tranny
Carl: ur sister a mister

*every world ceases to exist as God himself falls down onto his knees and weeps

National Slap Your Sister Day 

On October 25th you can slap your sister all you want and you won’t get in trouble.
Hey why is your sister crying

Because I slapped her for National Slap Your Sister Day