noun. A fan who follows a rock group around on tours.

noun. An enthusiastic supporter or follower.

noun. A young female fan of a rock group; a person who seeks intimacy (most often physical, sometimes emotional) with a famous person, usually a rock band member.

noun. an enthusiastic young fan (especially a young woman who follows rock groups around)

"Plant once said the difference between a fan and a groupie is a fan is someone to have sex with and a groupie is someone who wants to take care of you like a mother or girlfriend."