Emo

Emo stands for emotional hardcore, and started with bands like Rites of Spring in the 1980s. It then dipoed in popularity until bands like Dashboard Confessional and Fall Out Boy re-invented emo into subgenres like emo-pop amd indie-emo. It does not mean cutting, being depressed or gay.

The main reason emos self-harm is because they are bullied by haters.