Used to describe someone who is outwardly picky and meticulous about everything, but seems to be unaware of what's nasty about themselves at the same time.
An example would be a woman who insists that you take your shoes off before you come into her living room....but she hasn't dusted her furniture since she bought it.
She is someone who is nice nasty.
The act of doing one thing and not the other; One who accepts the worse and complains about the best, a backwards thinker, a walking paradox, completing a task and leaving out the most important part, doing something totally backwards, ignoring priorities of major importance and acknowledging the minor.
Justin is Nice Nasty because he didn't wipe his ass but he had the nerve to wash his hands.
He's Nice Nasty because he'd happily eat any kind of feces as long as it had brown sugar on it.