The phrase "nerdy girl" refers to a girl who is really interested in and knowledgeable about academic subjects or hobbies that are often considered nerdy, like math, science, or computer programming. Full definition
I was that nerdy girl in school that was always bullied, always the outcast because I didn't follow what was popular and didn't fit the mold, and I still think of the series that way. (gamasutra.com)
I'm just that nerdy girl next door that grew up to be a bombshell: — RRB - I love graphic novels, classic movies and trying something new. (sugardaddyforme.com)