the GNU version of the Collaborative International Dictionary of English
n. Sweepings; refuse; the lowest order of society.
The Century Dictionary and Cyclopedia
n. Scraps; refuse; rubbish; trash.
n. The rabble.
n. Sport; fun.
WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
n. disparaging terms for the common people
Word Usage
"I think the Campbells using the term riffraff (one word by the way) was unfortunate, because from context they mean criminals and the term riffraff has additional social class connotations that are inappropriate."