Whenever a region's sports team suddenly gets really good really quickly, everyone and their fucking dog either buys a sports jersey or takes their old one out of the closet where it's been for 20 years, proclaiming they are a diehard fan. Bandwagon fans usually flock to their team's games in large numbers and usually constitute 80% of that team's fanbase. See Florida Gators.
Gators Bandwagon Fan #1: Hey man, I heard Tim Tebow is playing today on TV!
Gators Bandwagon Fan #2: Oh yeah! Who cares that I didn't know who the Florida Gators were before their national title season! I'm a Gator Fan for life!