And hip-hop ain't dead, it just had a heart attack
But you see I keep it pumpin, yeah I got that heart back
So just call me Little Carter, or Little Cardiac

from Ludacris (Ft. Lil Wayne) – Last of a Dying Breed Lyrics on Rap Genius

Claiming that hip-hop simply had a heart attack and never died. He is keeping it pumping (i.e. rocking, bumpin, lively), with the double meaning of keeping the heart of hip-hop pumping. And finally a play on his aliases, Little (Wayne) Carter, or Little CarDIAC, cardiac is the muscle type in the human heart.

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