I got this ho that after 12 million sold
Mami's a narcoleptic, always sleeping on Hov
“Sleeping on” somebody means not being appreciative of their success or skill. Jay had sold 12 million records, but this one girl simply wasn’t impressed: she was “sleeping on him”, as though she were narcoleptic.
Likewise, she sleeps with him often.
Jay is referring to the rap game, which despite his success, still fails to give him the recognition he feels he deserves.
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