French, from boulevard
First Known Use: 1871

{N} 花花公子

A visitor of a city boulevard (especially in Paris).

A cultivated person who frequents the most fashionable locales in cities like New York, London or Paris.
A boulevardier must express their sense of high fashion and have knowledge of advanced cultural pursuits.

The Oxford English Dictionary rather prosaically defines a boulevardier as ‘someone who frequents boulevards.’ However the word can be expanded considerably to include the ‘man/woman-about-town’ who enjoys fashionable living. Furthermore it could be added that he/she will frequent public places such as squares, cafes and fashionable streets. In fact he/she could well be regarded as a ‘bon vivant.’

… more dense as the Faubourg Montmartre was approached, but Wilkie made his way through the throng with the ease of an old boulevardier. He must have had a large circle of acquaintances, for he distributed bows right and left, and was spoken to by five or six promenaders. He did not pass the Terrasse Jouffroy, but, pausing there, he purchased an evening paper…

— The Count’s Millions – Volume 1 (of 2) • Emile Gaboriau

…even suburban. There is no provincial quite so provincial as he who has passed their life in great cities. The Parisian boulevardier taken away from the asphalt, the cockney a little off Clapham Common and the Strand, is lost. Henry Adams knew his London and his Paris, his Boston and his Quincy—we must not forget Quincy—well. But he had been born, and had grown up, between the lids of history, and for all his…

— Marse Henry, Complete – An Autobiography • Henry Watterson