You will find in King Lear by Shakespeare this intimidating string of insults:
A knave, a rascal, an eater of broken meats; a base, proud, shallow, beggarly, three-suited, hundred-pound, filthy, worsted-stocking knave; a lily-livered, action-taking knave; a whoreson, glass-gazing, super-serviceable finical rogue; one-trunk-inheriting slave; one that wouldst be a bawd in way of good service; and art nothing but the composition of a knave, beggar, coward, pander, and the son and heir of a mongrel bitch; one whom I will beat into clamorous whining if thou deniest the least syllable of thy addition.
What is an eater of broken meats? This insult indicates that the person is poor and eats other’s leftovers. Often times less palatable parts of the animal are ground up and made into things like sausage. This, I believe, is what they are referring to. Not actually taking the discarded food of others out of the dumpster out back.