Someone who has good grades, but also still makes time for friends and good times. They do wear glasses, but the type that you see in magazines not on harry potter. They own high socks and sweater vests, but at the same time they do not scare away all of the male species by making it look like a fashion disaster. They manage to look quirky, instead of a social leper.
Man she's a preppy nerd, I'd whisk her away from the library.
She's actually out partying, she must be a preppy nerd, not a grosse nerd.
I'm in love with a preppy nerd, she may be smart, but she's hot.