dude Meaning, Definition & Usage

  1. noun an informal form of address for a man
    buster; fellow.
    • Say, fellow, what are you doing?
    • Hey buster, what's up?
  2. noun a man who is much concerned with his dress and appearance
    gallant; dandy; clotheshorse; fop; beau; swell; sheik; fashion plate.

WordNet

Dude noun
Definitions
  1. A kind of dandy; especially, one characterized by an ultrafashionable style of dress and other affectations. Recent
    The social dude who affects English dress and English drawl. The American.

Webster 1913