People who are easily provoked and for no reason hostile to anyone. They usually attempt to provoke people by insulting people without knowing nothing of their victim. Ragers are commonly found on the internet and online games, for they have no life in the real world so they must retreat to their virtual world.
Online gamer "Yay, I killed someone"
Rager "Get a life you F**king noob"
Online gamer "Huh? I'm just enjoying the game you should too :)"
Rager "Your mom"