The word is now used as both an adjective and a noun.
As an adjective it refers to anything not of the norm, lame, of bad quality, or cheap. It can be used in place of or combined with any cuss word with good results as well.
As a noun it takes on the form of "Juke" which relates to any person possessing the qualities that imbue the adjective.
"The dialog in this movie is really jukie!"
"Get your jukie ass up here now"
"Shut up and listen to me, you juke!"