They said they need proof like a vestless chest
About the best-fed F-F jet in the nest
Lupe is calling out the music industry, which demands proof of him while giving a free pass to fakes.
“Proof” is old english slang for armor, an etymology that dovetails nicely with the modern bulletproof vest — lacking one, you would be “vestless.”
This may also be a macabre reference to the rapper Proof (of D12), who was shot in the chest back in 2006 after a nightclub altercation..
“F-F”; is First & Fifteenth, Lupe’s now defunct record label, a label which keeps (kept) its artists well-fed.
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