Not related to homosexuality in any way. Its a play on words using the legendary tron legacy movie. It simply defines someone who surpasses the absolute limits of mind numbing idiocracy and exhibits pathetic behavior to the point of being an idiot wrapped in a moron who has no ability to think for themselves n hence are a walking/talking robot therefore representing a legacy of retardedness as a definition of themselves.
Tom: he is such a faggot for doing this
Harry: he is so stupid i swear he has indeed now reached a faggotron level n will leave this legacy for all to remember him
This is not a derogatory word when used in the correct context.
This is generally a gay man who is a little flaunty and subversive with it instead of full on clean cut and well behaved. They are the ones between Generation X and Millennials. They know what the original Tron film is and love it. They are unafraid and fascinated by technology but also know how to deal with a life in the natural world without a connection to the web.