1. Being jealous of a celebrity, be it because of wealth, posessions, experience, or lover.
2. Extreme protectivism over your celebrity of choice. This includes obsession in all forms, ex: collecting pictures, reading all available interviews, watching all TV appearances/movies, and growling at and/or biting anyone who unwittingly hits on your sweetie in front of you.
SHH!! Don't say Gerard Way is hot in front of Mary; she'll fucking bite you!! She's in love with him more than you, that's why. o_o
2. An emotion that typically refers to the negative thoughts and feelings of insecurity, fear, and anxiety over a feeling of inadequacy of one's place of residence when in comparison to Nelson.