Someone who claims to be a big fan of a certain band, has a shitload of the band's merchandise(hats,tees, braclets neckties), yet in reality, this person only knows a few of the bands actual songs, usually greatest hits. Bands which are the targets of fake-ass fans are usually old rock bands like AC/DC,Led Zeppelin,The Doors,KISS and The Ramones. But this can be consistant with any kind of musical artist. Excessive owning of such merchandise can also mean a weak attempt to look "cool" or "hardcore"
Jimmy had pretty much every single bit of KISS merchandise, everything from toothpaste to socks to braces. But when asked to list some of his favorite songs of theirs he could only think of two of their songs,"Rock and roll all night" and "Strutter". He was a fake-ass fan.