A superficically dumb valley chick, with no common sense what so ever. Usually of white race, rich, and pretty. Often uses words such as "like", "oh my gosh", "oh my goodness", "that is like so not cool at all", "dude".

Paris Hilton, no other words needed.

A scatterbrained or eccentric person.

Someone who isn't necessarly stupid, they just lack good judgement in their decisions and good common sense. Most of the ditz girls I've met have been pretty, I guess they think pretending to be stupid makes them sound cute.

a giddy or frivolous person (often female)

stupid girl, ususally blonde and rich

Someone, usually a girl, usually blonde, who is pretty but rather stupid. Sarah Sanderson in the movie Hocus Pocus is a prime example.