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.
by Good Golly May 22, 2009
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Riff Amnesia happens when you go into a musical instrument store to try out amps and guitars but once you get down to the actual playing of the guitar you loose all memory of the riffs you know and everyone within earshot thinks you suck.

Riff amnesia often makes the sufferer feel vastly inadequite to the guys who peel off ball tearing solos at the shop to show off.
"Man, I went to Dinny's to try out that new Les Paul Custom but got Riff Amnesia and couldn't play anything. The guy in the next room started playing Metallica solos to show off. I felt like a fool."
by The Riff Master April 7, 2009
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A marijuana hit that makes you cough till you gag.
That last hit I took was the rizz riff.
by Giant Jerkoff July 12, 2017
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The singing battle between the Acapella groups on campus, from the movie Pitch Perfect (Anna Kendrick, Rebel Wilson).
"Hey, are you coming to the Riff Off this evening?"
by indigounicorn January 15, 2017
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White rapper who is "hotter than a old thelma and louise sweater"
Riff-Raff "Diamonds cause head on collisions, ruined the transmission on your brand new prescription"
by Tluvifyourenasty July 10, 2011
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A negative term for people that lack social grace, education or that have minority status.
The new housing that's going up is driving out the riff raff.

I enjoy the Midwest because of it's low amount of riff raff.
by Barrando October 10, 2011
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When a guitarist is deep in a riff and their mouth appears to be whispering words.
James is riff whispering so much when he shreds, he looks like he's praying.
by RouseMeNot May 6, 2020
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