Another rapper claimin he hot
But couldn't be if he was Damien's pop
That was once an angel from God

from J Dilla (Ft. Elzhi) – Come Get It Lyrics on Rap Genius

Damien in the movie “The Omen” is Satan’s son. El is saying even if an artist is Satan himself burning in the flames of hell(extremely hot, obviously) he wouldn’t be hot. The meaning is, he could never be a good rapper basically.

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