Anyone who posts, (most commly in the comment section of a website), that says "first"....usually in the hopes that they are actually the first poster to comment of the given topic.
A firetard is when someone makes you so angry you feel a fire start in your chest then it blows out and spits out words that could potentially hurt someone but you did not intend it to. Such as swearing when you are mad, fucktards are uncontrollable.
An offensivemisspelling of the popular Warrior Cat's character Firestar.
Recently, someone used this as an insult, and it has been blowing up in the tumblr warrior's fandom ever since.
Fangirl1: Haha, Firestar is such a Firetard. Firetard and Gaystripe bitches!
Fangirl2: OMFG YOU DIDN'T! SO OFFENSIVE. RAGE!
Fangirl1: Oops, just misspelled Firestar! My bad.
Fangirl2+rest of fandom: NO YOU DIDN'T YOU OFFENSIVE INSENSITIVE POOPYHEAD! LEAVE TUMBLR NOOOW