"dude" in the noun sense
1. fellow, dude, buster
an informal form of address for a man
"Say, fellow, what are you doing?"
"Hey buster, what's up?"
2. dandy, dude, fop, gallant, sheik, beau, swell, fashion plate, clotheshorse
a man who is much concerned with his dress and appearance
Source: WordNet® (An amazing lexical database of English)
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