A co-worker who isn't very productive, generates a lot of noise and metaphorically throws shit everywhere.
Those three new engineers looked great on paper, but once they were set loose on a project it became apparent that they were a bunch of howler monkeys.
A useless or self-serving organization. A wasteful business run by incompetents. A public sector organization with no useful purpose other than to generate paperwork, internal reports and provide incomes for its executives. A quango.