Someone who never stays true to the same teams. They're always fans of the best teams.
Ryan: Man I love watching my teams dominate.
Jared: Who are your teams?
Ryan: The Tampa Bay Rays, Boston Celtics, & NY Giants.
Jared: WTF, last year your teams were the Yankees, LA Lakers, & NE Patriots.
Ryan: What can I say, I'm a front-runner fan. The Yankees aren't gonna make the playoffs, the Lakers lost last year in the Finals, & Tom Brady is out for the season.
One who acts as if they are a true fan of something when in reality they don't know much about it (i.e. bands, sport teams..ect)
-- Dave just got a Redsox hat and jersey. He must be a true fan.
-- No way dude. He's an idiot who doesn't know shit about the sox. He only did it cause they made the playoffs.
A frontrunner is 90% of Dallas Cowboys fans. Most have never even stepped foot in the state, let alone the stadium.
Dig'm- "Hey Gulmers, why do you like the Cowboys again?"
George Jr.- "Because I'm a front runner from the 90's!"
George III- "Because my dad's a front runner and I want to grow up to be just like him!"
Dig'm- "Outta' here LOSERS!"