"Seriously, man!?" (4)

I believe the answer is:

dude

(Other definitions for dude that I've seen before include "He's no cowboy" , "An American dandy out west" , "Stylish and affected man" , "Dandy - city dweller holidaying on ranch" , "Dandy - US or Canadian city dweller" .)

I've seen this clue in the LA Times.

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