Bullycide is the act of killing onself due to being bullied, or it involves the victim killing the bully first and then killing him/herself. It can even manifestate as a large scale school shooting.
Signs before a victim takes revenge or commit suicide:
Hating the bullies' religion.
Extreme hatred of the human race and nihilism.
Crying more oftenly.
Purchasing of weapons.
Doing goodbye videos on youtube.
Major Depressive disorder.
Examples
Many girls choose to kill themselves but boys tend to commit mass murder first
Red lake senior high massacre
Columbine high school massacre
Virginia Tech massacre
Suicide of Amanda Todd
Suicide of Pheobe Prince