noun

• (usually uncountable) The state or quality of being a dude, a man who is very concerned about his dress and appearance.
  "Aristophanes in Washington would do more than our President to grease the wheels of Civil Service Reform; while a Moliere or a Beaumarchais in New York would go far to put an extinguisher upon anglomania, dudism, snobbery, and tawdry display, and to help the solution of the vexed question between labor and capital"
• (uncommon) (An instance of) speech or behavior typical of a dude, a young man.
  "Everyone in the San Fernando Valley knows that the Galleria in Sherman Oaks, the setting for much of Fast Times at Ridgemont High, is the quintessential dude/Valley girl frolic zone. So where is all this leading us – to the total commercialization of dudism? Maybe a Wayne's World line of clothes from Urban Streetwear."