I bet I hit it where every rapper get killed, like
Bla bla bla bla where the knife at?
Cut cut cut where your life at?
Your careers over, he’s slumped over

from Kendrick Lamar – Look Out For Detox Lyrics on Rap Genius

Meaning

He kills rappers by first shooting and injuring them, then when they’re down, he cuts them to death with their knife. He means this metaphorically in relation to their careers.

OR… he could also be saying that he’s so dope he’ll be killed like Big and Pac.

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I bet I hit it where every rapper get killed, like Bla bla bla bla where the knife at? Cut cut cut where your life at? Your careers over, he’s slumped over

I bet I hit it where every rapper get killed, like
Bla bla bla bla where the knife at?
Cut cut cut where your life at?
Your careers over, he’s slumped over