Call them Lu-vi's, old jeans covered in blue dye

from Lupe Fiasco (Ft. Jay Z) – Pressure Lyrics on Rap Genius

Meaning

Lupe compares his music to old and worn Levi’s jeans (Lupe + Levis = “Lu-vis”) — he raps as a throwback to the lyricism of the days of old-school hip-hop

Also, notice the allusion to the violent gang Crips, whose primary color is blue. In keeping with this interpretation, the line could be read homonymically, as “O.G.’s covered in blue die”, which would serve to remind us of the tragic fate that befell Biggie and Pac (although Pac — via Suge Knight — was primarily affiliated with the Bloods..)

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