Someone who, in every aspect, conforms to the majority of people in their country. If the majority of people in their country have black hair, so do they. If the majority enjoy rock music, so do they. Basically, odds are you know at least one, unless you live in a statistic-ruining place, like a wacky college or some kind of commune.
Take me, for example. I'm a white male who voted for Obama. I have brown eyes and black hair. I'm of average height and weight, enjoy football, and have a desk job. I live in IL, in the United States. (pretty average state if you ask me). When I get out of college, I want to be a teacher. I even honestly enjoyed Owl City's Fireflies, and before that I liked Kanye, and before that I fell in love with 50 cent. (the majority of rap fans are white) I'm a majority person.