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No one called a girl or woman "dude." A "dude" was either a dandy in unsuitable fancy clothes, someone who never worked a day in their life (hence, the "Dude Ranch"
or, later, an identifier for a male during those "hippie years" in the sixties and seventies "Hey, dude, don't bogart that thing, maaaaan."
That said, language does change. No one says "groovy" or "hep cat" anymore, except to be ironic.
something that we learned when singing, by the way. 
Explosive t
It's a fascinating dialect style. We have a local TV meteorologist who has a promo running about the station's weather reports where she talks about the differences in the area's micro-climates and when giving examples, she ends with "in the moun'ins". And every time I hear it I think the same thing. A "swallowed T"!! 
will probably hear an earful of some wild Fluffian accents!! 
(e.g., Tweety has one version)
