A female who becomes a fan, or likes something for the fallowing reasons;
a.to impress someone
b.to fit into a crowd
c.to piss someone off
d.Because the team wins a lot (related to sports)

This person normally dose not know anything that they are talking about but think they do

When one joins a group on Facebook and wants so bad to be 'in' with the popular posters/ members.
That they will join in on any 'bashing/ flaming' of another member just to fit in.

Also for people who want to fit into a group so badly they will befriend people they hate. Then attack what were once friends just so they are part of the groups 'in' members