This person has no personality/individuality of their own. They will go around and do whatever is considered 'Cool'. Eg: Dressing like a particular celebrity just because their popular friend told them it was 'Cool' to do so.
Or, disregarding a set of ideologies because that's what the *insert popular individual/group* said.
Also, people who blindly believe anything that the media shows on the TV.
Kyle: Dude you're such a flockhead.
2) Girl 1: OMG ONE DIRECTION!!<3 <3 THEY ARE SO COOL THEY HAVE SO MANY FANS LIKE OMG and the GUYS ARE SO HOT LIKE WOW
Girl 2: You mean you don't like them for their music? such a flockhead.