dude dude /ˈduːd/

noun

1. [Informal] A man who is much concerned with his dress and appearance  ( beau [Archaic] , clotheshorse [Informal] , dandy , dude [Informal] , fashion plate , fop , gallant [Archaic] , sheik , swell [Informal] )
   a man who is much concerned with his dress and appearance
   
   
2. [Informal] An informal form of address for a man  ( buster [Informal] , dude [Informal] , fellow , bo [Informal, American] , bruv [Informal, UK] )
   an informal form of address for a man
    Say, fellow, what are you doing?
   Say, fellow, what are you doing?
    Hey buster, what's up?
   Hey buster, what's up?