I'm kin to coup de
I’m kin to Kunta
Kendrick is saying black is back and he’s kin(family) to Kunta.
“Coup De” is a shortened version of “Coup De Grâce” which means to put a wounded animal out of its misery in french. Kendrick is saying that he is going to end the suffering of other weak artists.
“Coup De” can also be short for “coup d'etat"
meaning he’s going to overthrow the "system” which is usually responsible for (from the next line) black on black crime.
To help improve the meaning of these lyrics, visit “Illuminate” by Ab-Soul (Ft. Kendrick Lamar) Lyrics and leave a comment on the lyrics box