1. Noun: A little known state of matter in which one is both Heather and completely amazing. That is, a person, place, or thing which is unbelievably awesome.
2. Adjective: To be full of originality and coolness and a certain something that just wows people.
1. "Look at that Heatherocity, isn't she just the coolest person alive?"
2. "This band is so rockin, they're exuding Heatherocity!"