Dirtbaggery
I really didn’t understand what the term “dirtbag” meant (any more than a vague connotation) until I was around some ROTC guys my freshman year of college. My understanding now is that the term deals less with filth (the primary aspect of the “dirt” component, one might say) and actually is more concerned with the “bag” component of uselessness, drawing on the “dirt” component only for weight and perhaps inauspiciousness.