A Heather is a name for a stereotype, such as
Betty, Karen, Kyle, Regina, Stacey,
Chad and so forth. If you were to put these stereotypes on a map, a Heather would be right next to Stacey and Regina. For further understanding of a Heather see the movie Heathers. A Heather combines the
bimbo quality of a Stacey with the cutthroat mean
girl quality of a Regina. In fact, where Regina's most notably employ passive aggression, a Heather is much less subtle. If you meet a nice Heather, that is like finding a unicorn that shits 4 leaf clovers.