Only used for someone of the male persuasion. Meaning only dudes. Used when you don't want to say cute, because it's not enough, or handsome, because it is too old fashioned or hot, becuase that's too degrading. This person must make you feel happy inside and has to have a very good personality to match the good looks.
He always smiled and said the funniest things. He cared about other people and was so damn fine. Man, that dude is happable.