Obsessive research and knowledge concerning the "likes/dislikes," genevation, habits, pet peeves, and other extraneous trivia concerning the idol are attributes shared among this stereotypical group of fans. This overly exhuberant fan exhibits traits such as promiscuity, daring and often irrational behavior, as well as, loss of self control when exposed to the object of their obsessions.
Most commonly viewed as consumed by their interest, as opposed to the normal realm of enjoyment experienced by the great majority of public.
A young woman who has a one way love with a band/musician.
The young woman can sometimes turn into an industry girl.
References: Almost Famous, Rockstar (movie).
The term gained a negative connotation when those who were jealous of and/or didn't agree with the groupie lifestyle started using the word with a negative connotation. This turn was also attributed to many of the value-less groupies who began using musicians to gain fame or money after giving small sexual favors to roadies and lowly crew members.
"Pamela Des Barres is the coolest groupie ever! She dated Jimmy Page and hung out with John Lennon!"
Groupie is derived from group, meaning a musical band, but now has more general application.
Female groupies in particular are known for a long-standing tradition of being available for, and willing to have, sexual intercourse with celebrities and rock stars. While only a small number of groupies are truly promiscuous in that they are willing to trade sexual favors for attention, the tradition of "rock and roll groupies" continues to the present day, contributing to the image of the rock-and-roll lifestyle as one where sex and drugs are readily available at any time.
for examples because I can't post a screenshot.