Spirit sisters 

Spirit sisters are two women who get along with each other REALLY good. Their chemistry is so good that they can not just be friends. They are more than friends but keep denying that they are dating.

Best example: Natasha Negovanlis and Elise Bauman

Interviewer: "You two are certainly more than friends."
Elise Baeman: "No, just friends. Spirit friends."
Natasha you-can-nego-my-vanlis-anytime: "Spirit sisters"

Spirit sisters by imonmywayandgay April 11, 2018

Spirit Sisters 

Spirit Sisters are two women who get along with each other really good. They are certainly more than friends.

Its also used as a slang for two dating women but they want to keep it from other people (like fans).

"You are certainly more than friends"
"Yes, we are spirit sisters"

Spirit Sisters by imonmywayandgay April 12, 2018

Spirit sister 

Two Girls who have strange similarities And enjoy having picnics together. They often have similar shoe choices and enjoy eating vegan food together.

They have so many similarities they must be spirit sisters!

Spirit sister by a very smart pookie June 17, 2014