Originally, 'dude' referred to the hair at the base of a horse's tail. In the late 1800's, horse ranches became known as "dude ranches". And therefore, the men who worked on a "dude ranch" became known as "dudes".
Tell that dude over there to get my stallion saddled-up.
by DarkLotus August 31, 2005
an interjection to show excitement or emphasis or lack there of. Having nothing to do with an actual male person or person of any sex. It is a word just to convey emotion. Much like "Oh Boy", "YAY!", "WOW", "Totally Tits", "Hella" or "Jesus Tits"
Dude. You have some hella tits. Want to come back to my place and i'll show you what Canadian history is all about.
by Gorilla face vs white dragon April 16, 2010