Super sister 

A girl that is apart of your “family” whom is a step sister but also a sister in law

“Alexis is dating Chris and they’re getting married, but now their parents are dating”
“DAMN Alexis a super sister”

Super sister by GoddessWhore June 4, 2021

Super Party Soul Sisters  

When you and your two friends who are good looking enjoy a hand full amount of partying with ugly people.While you are partying, you are also soul sisters, and that makes the partying so much better. You form what is called a super party soul sister trip dick, where one of you walks into the party in the middle, with a sister on each side.

"Hey guys, I hear that the super party soul sisters are coming out tonight! It's gonna be a great party!"

Super Party Soul Sisters by fuckai March 19, 2007

supersistence 

A state of more than existence. In contrast to subsistence, to supersist is to live very well, to thrive or to flourish.

Dave believed in living life to the max. He wasn't happy with just existing. He reasoned that he was here for only a short time, and therefore that time was going to be one of supersistence.

supersistence by Justin Washtell December 31, 2006