THE insult. A fagtron is a person who has so many negative qualities such as small genitalia, ugly features, a lack of brain matter, lack of pubic hair, and severely faggy personality traits like being annoying, touchy, loud, stupid, or lame.
fagtron: Hey guys. Star Wars sucks. I love Star Trek!
Cool kids who like star wars and get mad pussy: Dude, you're a fucking fagtron.