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1.
A book about a girl that comes to a conformed school and has an impact there.
"Did you read Stargirl in school?"

"Yeah, but I hated it."
by Beckat February 11, 2007
 
2.
The kind of boring girl that is not willing to do lot of things or she is not willing at all. The word star, as a reference to a girl in bed doing nothing but the star and waiting for the guy to do the whole work.
Friends : Hey! Wanna grabs couple of drinks with us tonight? the exams are done!

Star girl : Oh I can't! I have to start working on my assignment due for next week...

Friends : You're such a star girl
by justforlaugh514 February 17, 2013