Whats a pyro?
In most cases, pyro is short for pyromaniac, or someone who is obsessed with fire. When people call you a pyro, they don't usually mean you are a pyromaniac, but just someone who is fascinated by fire.
Pyro translates into fire Ex: Pyro-maniac is a person who is crazy with fire.
Somebody who loves fire and Def Leppard! :-)