A fork of Rural Dictionary
Dudesandude-san San is used as a courtesy title in Japanese-speaking areas as a suffix to the given name, surname, or title of the person being addressed, regardless of age or gender: Yamamoto san; sensei-san. You don't speak Japanese, can't pronounce the name, or you just don't know their name so you just add Dude. Or it's just one of your buds.
Yo "Dudesan" can you get me another beer form the bar I'm hittin' the can.