Sistager

It derives from "sister" and "manager". It refers to a sister who servers as a manager to her siblings.

A sistager will tell you exactly what to wear and how to speak.
My sistager answers calls on my behalf.

by Lebanesegov September 9, 2022

sistagal

a mildly ghetto term for friend who is a girl, expresses that you consider this person a friend can even be used aggressively in an argument.

“Calm down sistagal, it’s not a big deal”

by Miha Bassinet September 15, 2020