a girl or a group of girls that go around and have sex with nothing but celebrites
a girl who likes people in a rock-and-roll band
a girl with music in her blood and a wide heart for musicians
a person whose devotion to a person (usually a celebrity, especially a rock and roll star) approaches the level of fanaticism
A groupie is a person who, while she/he may be a fan on some level, seeks intimacy (most often physical, sometimes emotional) with a famous person.