Not a jerk sick as this, with words ridiculous
He's only nineteen -- I got birth certificates

from J.R. Writer – 9 Minute Freestyle Lyrics on Rap Genius

Meaning

Rusty “J.R. Writer” Brito was born in 1984, which would put him at about the right age — though this mixtape was released in 2005, this radio freestyle was likely recorded earlier

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