A luddu is a girl who is in the popular private school girl click. Thinking that they are too good for everyone else, they talk in luddu language and add "du" or "da" to the ending of almost every word imaginable. Luddus first originated in a small group of high school friends but are quickly growing in the college world. It is very easy to spot a Luddu especially in a bar or club. They are usually the ones dancing nastily, kissing, sucking, or humping on random guys. Dont let a Luddus look's fool you guys. 99.9% of them are infested with some sort of STD. Most Luddus are in a soriority in which they end up becoming lesbian or pregnant before they finish school.