The unwashed masses. The Hoi Polloi. The kind of people who would spend a day on a public beach going into the water without taking their shirts off. Riffraff are often followers of Sarah Palin, and when they happen to be white are often known as "real americans".
(noun) :An assortment of unpleasantries on a face. Can include acne, acne scars, pimples, beard stubble, actual beard, peeling skin, etc. Most often seen on teenage boys.
Girl 1: Billy used to be so hot.
Girl 2: Yeah, it's sad that he has all that facial riff-raff now.
A male or female who has no motivation whatsoever. They do not work, mooch off of people and are totally content in doing so. They would much rather just hang out all day long, and are content with how things are and don't ever plan on making things better, even if it can help them in relationships.
When deciding whether or not to get a job,Jake,the riff raff decided he would much rather just hang out and do nothing for the day.