A derogatory term used to refer to a young girl (late teens/early 20s) who is intelligent and well-educated, but naive and gullible. She thinks she knows it all when, in fact, she has almost no understanding of the world other than what she was told in the classroom. She thinks knowledge compensates for good judgment and experience.

1)A girl who attends school, usu. referring to private or preparatory schools where uniforms are wore.
2)Any female wearing a uniform similar to that of a private/prep school student. Uniform consists of a white, short-sleeved top, sweater, plaid/single colored skirt, knee-high socks, and loafers; usu. referred to in the sense of a fetish.

Usually seen on websites for dirty old men who can't be happy with good looking women their own age.