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1. a pyromaniac, some who sets fire to random people, animals, or objects as a form of gratification

2. any arsonist
(from a type of insect that has nothing to do with fire despite it's name)
That guy must be a firebug if he keeps starting fires like that.
by The Return Of Light Joker April 17, 2008
A girl who is so obsessed with meeting and dating firemen that she will start fires and put herself in danger to be rescued by them.
Johnson, shes a firebug. get rid of her before you get burned.
by NothStar December 15, 2010