Definitions for riffraffˈrɪfˌræf
Random House Webster's College Dictionary
the lowest classes; rabble.
Origin of riffraff:
1425–75; late ME rif and raf every particle, things of small value < OF rif et raf
rabble, riffraff, ragtag, ragtag and bobtail(noun)
disparaging terms for the common people
The rabble; crowds; the common people.
They started charging a modest fee in an effort to keep the riffraff out.
low class, ghetto, indigent
sweepings; refuse; the lowest order of society