An amalgam of the word "Poop" and "Fantastic." Something that is so fantastically "poopy" that it is noteworthy. This particular quality invokes feeling not of dismay, but awe. When something is pooptastic, it is unalterable - you must simply walk away.
The art of being Pro as in professional, linked with fantastic, therefore creating protastic. Pro in protastic could also be defined as a pro versus a con.