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A phrase given to represent the ratio of time it takes a rap song to lose its popularity vs. actual years. (similar to dog years) 1 rap year is equal to 2 Months
Guy 1: Is this "Ridin Dirty?!?!"

Guy 2: Yeah so what it's a classic.

Guy 1: Dude this song is like 100 years old in rap years.
by Mr. Hiroshima February 16, 2009
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