any vehicle with a diesel engine that has a modified fuel system allowing it to be run on vegetable oil. often driven by hippies and environmentalists.
it's cheap and easy to make your own veggie bus. a diesel engine can be run on any combination of fuels including used french fry grease, lard, paraffin, motor oil, ethanol and biodiesel, the latter being the best if you want your engine to last long.
any gang of anarchisthobos who have banded together for the chief purpose of covertly breaking into dumpsters and living off of society's waste. often travelling on some sort of retooled vehicle run on recycled oil.
check out the dumpster pirates on their veggie bus! what an eyesore! I really hope they leave town soon.