an expression of general awesomeness, used under different circumstances, such as amusement, severity but also irrelevance.

definition in german:

schplü schpl'ü 1. n <-,-> kultur, un-kultur, neudeutsch, alltag, philosophie, pathologie, politik, polizei, popcorn, buchstabe, wort, un-wort, bindestrich, kunst, banane, finanzen 2. adj adv fam lustig, erbärmlich, nett, unnötig - URSPRUNG unbekannt