Every guy may have his specific girl-next-door prototype, but in general, she's the girl whom you always admired from afar and were afraid to approach, fearing that any erotic projection toward her would ruin her image as a decent, pure and almost virginal womanly ideal.
She's (in your mind at least) untrodden ground; unspoiled by other men and so sweet-natured it almost frightens you to think of her in explicit sexual situations. Almost. Here's another example: Picture your sister's best friend from when you were kids. In your mind she'll always be that 10-year-old cutie who played with you in the park. Only, when you catch up with her 10 years later, she's still a cutie, but all grown up and someone you can trust and connect with on so many new levels. The intrigue grows.
Similarly, she could be a friend's cousin whom you met at family occasions over the years. Or even a new employee at work who is shy and unassuming, but still gives you that "she seems so nice, I'd love to talk to her" feeling.
Think of Renee Zellweger's character in Jerry Maguire
That girl you see everyday, she makes a really great friend, is super sweet and is the perfect girl to bring home to you're parents.
She is also very attractive, and modest about it.
Joey Potter from the hit WB show 'Dawsons Creek' is the pefect example of a girl next door type.
She's the girl who's right for you, and she's been right under your nose the whole time. It's so obvious and you never want to ruin her because she's the perfect girl for you.
She's the kind of girl who all the Douche bags get to, and yet, you never get with. She's the Girl Next Door.
A girl next door is basically someone that is sweet, wholesome, and an easy going person. She is the girl that has no one looking at her because the whores with big boobs get the guys first. She is very shy and modest but when she is yours she is a cougar in the sheets.
Bob: Do you see that hot girl?
G:(thinking) Does he even notice I'm right here? maybe I shouldn't be the girl next door anymore.
a girl that lives next door
Me: Hi, do you live around here?
Her: Yeah, I'm the girl next door!
Well, I mean there's those girls who are just "Hollywood" types. They're all dolled up and sure they may look great on TV/movies, but they need make up to do so. Then there's the girl next door whose beauty is understated, and doesn't need all the makeup, cameras, and bright lights to look pretty. She's just pretty without all of that.
She doesn't have to try to catch my eye. She's like the girl next door.
The girl that is nice and you would like your parents to meet. Makes a great friend and above a good girlfriend
I wish I could be the perfect girl next door