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1.
A song that has been Riffed has been covered in a louder, ballsier way.
this song is better now it's been riffed.
by bassnick September 25, 2006
 
2.
Baseword Acronym: Reduction In Force referring to workplace employee layoffs

Whole word is past tense use of the base acronym and refers to someone who has been laid off due to lack of work.
Dale was one of the guys that got RIFF'ed as part of the staffing reduction.
by billardbb January 15, 2009