FOB is an acronym for Fall Out Boy, a band who has recently become quite popular. They have three CDs, as well as at least two EPs. They are on Island record label, which is the same label as The Killers. They used to be on Fueled By Ramen. Just because they have recently subcome to popularity doesn't make them posers. They don't call themselves punk, because they aren't, so by not calling themselves something they aren't, they have avoided becoming posers. If you enjoy Fall Out Boy, you should listen to Panic! At The Disco.
"Oh you like the new song by FOB?"
"Have you checked out the new FOB video? It had Brendon from Panic! At The Disco in it!"