I have always liked women who sport the bimbo look and lifestyle but this is the first time I've written down my own definition.
The dictionary definition describes a Bimbo as a physically attractive woman who lacks intelligence (Noun - derogatory, slang). Personally I think there is more to it, I believe that it is a way of living that doesnt require a lack of intelligence. It requires a lot of work to maintain the physical attractiveness and a willingness to appear as a pure form of sexuality.
That effort can include cosmetic surgery or getting a bimbo-like occupation. Smart women can make a choice to live the lifestyle and show a 'dumb' side. It can weirdly give a sense of freedom to women who want a sexually dominant partner to take control and make decisions.