This document defines mean girls as girls who bully others using aggression, manipulation, deception, exclusion, and rumor spreading. It notes that mean girls target those they are jealous of or who stand out, and thrive on drama and cyberbullying. It provides advice on how to deal with mean girls, such as talking to trusted individuals, developing friendships for support, maintaining confidence, and being kind even to the mean girls themselves. The overall message is empowering oneself, surrounding with support, and rising above bullying with positivity.