According to a 1901 article quoted in this [answer][1] to the question, [Etymology of “dude” and progression in language][2], the original feminine version of _dude_ was _dud_.


  [1]: http://english.stackexchange.com/questions/24009/etymology-of-dude-and-progression-in-language/24011#24011
  [2]: http://english.stackexchange.com/q/24009/5822