Shaken, not stirred is a famous catch phrase of Ian Fleming's fictional British Secret Service agent, James Bond and his preference for how he wished his martini prepared. The phrase first appears in the novel Diamonds Are Forever (1956), though Bond does not actually say the line until Dr. No (1958). It was first uttered in the films by Sean Connery in Goldfinger in 1964 (though the villain Dr. Julius No offers this drink and utters those words in the first film, Dr. No in 1962) and was used in numerous Bond films thereafter, with the notable exception of You Only Live Twice, in which the drink is offered stirred, not shaken.
This phrase has become a recognizable catchphrase in western popular culture, and has appeared in any number of films television programmes and video games for its cliché value.
The American Film Institute honoured Goldfinger and the phrase on July 21, 2005 by ranking it #90 on a list of best movie quotes in the past 100 years of film.
Why shaken, not stirred?
Scientists, specifically biochemists, and martini connoisseurs have investigated the difference between a martini shaken and a martini stirred. According to a study at the Department of Biochemistry at the University of Western Ontario in Canada to determine if the preparation of a martini has an influence on their antioxidant capacity, the shaken gin martinis were able to break down hydrogen peroxide and leave only 0.072% of the peroxide behind, versus the stirred gin martini which left behind 0.157% of the peroxide. The study was done at the time because moderate consumption of alcohol appears to reduce the risk of cataracts, cardiovascular disease, and stroke, none of which afflict the fictional James Bond.
Andrew Lycett, an Ian Fleming biographer, believed that Fleming liked his martinis shaken, not stirred because Fleming thought that stirring a drink diminished its flavour. Lycett also noted that Fleming preferred gin and vermouth for his martini. It has also been said that Fleming was a fan of martinis shaken by Hans Schröder, a German bartender.
Some connoisseurs believe that shaking gin is a faux pas, supposedly because the shaking "bruises" the gin (a term referring to a slight bitter taste that can allegedly occur when gin or vodka is shaken). Others contend that Bond was only shaking because of the vodka it contained. Prior to the 1960s, vodka was, for the most part, refined from potatoes (usually cheaper brands). This element made the vodka oily. To disperse the oil, Bond ordered his martinis shaken; thus, in the same scene where he orders the martini, he tells the barman about how vodka made from grain rather than potatoes makes his drink even better. This does not explain why Bond in the films still preferred his drink to be shaken rather than stirred, because beginning mostly in the 1960s vodka refined from potatoes was virtually replaced by vodka refined by grains such as corn and wheat or by other ingredients such as grapes and soybeans.
Other reasons for shaking tend to include making the drink colder or as Bond called it, ice-cold. Shaking allows the drink to couple with the ice longer thus making it far colder than if it were to be stirred. Shaking is also said to dissolve the vermouth better making it less oily tasting.
While properly called a Bradford, shaken martinis also appear cloudier than when stirred. This is caused by the small fragments of ice present in a shaken martini.
Peewee goes for the figurative meaning still. 
