Some dude that is completely in love with his/her hair. They allways are touching their hair.
"Dude that dude is such a hair dude, dude."
A younger man or with a longer, shaggy or full hairstyle typical of the sexy fuller male hairstyles common in the 1970's. (This term should never apply to a female.)
Those shaggy surfer guys in California were real hair dudes back before cell phones were in fashion.