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The exclamatory tense of "dude," spoken after hearing/seeing something awesome.
Example 1:
Guy 1: So last weekend, I was doing shots with the Swedish bikini team...
Guy 2: Duhude, no way!

Example 2:
Guy 1: Watch this! (* does triple backflip off ramp *)
Guy 2: Duhude!!!
by no_way August 04, 2011