bum brigade

A large number of people of the homeless persuasion gathering together in one place. They can usually be seen massing by bridges or wherever there are cardboard boxes to be found. Usually travelling in packs, when you see one member of this brigade you can usually find the rest. Markings include layers upon layers of winter coats, which aid in escape when confronted by predators by creating a mass of confusion, much like zebra stripes.

Some guy: Dude, I saw a trail of winter coats leading down to your block from the train! What the hell happened?

Some other guy: O that's nothing, the bum brigade was passing through. I think they migrated.