1. Seeking closeness: Women calling each other 'brother' may be to bring them closer, create an intimate and distance free atmosphere, and show trust and dependence on each other.
2. Expressing Respect or Worship: In some cases, women may use "brother" as a respectful title to express their respect and admiration for older, capable, or respectable men.
3. Being coquettish or seeking help: Sometimes, women calling out 'brother' is also a way to act coquettishly, hoping to arouse the other person's desire for protection and help, especially when they need comfort, support, or assistance.