Low-life, riffraff. This expression dates back to the seventeenth century, when ragtag meant a ragged lot of people and bobtail a horse whose tail had been cut short (“bobbed”) and was considered valueless. Samuel Pepys in his Diary turned it about a bit: “The dining-room was full of tag rag and bobtail, dancing, singing, and drinking” (1658–59). The expression is not heard much any longer, however, at least not in the United States.