cusstodion
A whiny grumbly person --- most often a teenager --- who sulkily performs janitorial labors amidst copious use of swear-words to illustrate his acute discontent with having to carry out said activities.
School superintendent: I always make sure that all of the younger students have gone home in the afternoon before I assign cleanup-duties to any high-schoolers who have come under detention that day --- there are far too many cusstodions in these ranks for our tender-eared youths to be present during this period.