They said I could sing like a Jaybird
But nigga, don't say the J-word

from Ice Cube – When Will They Shoot? Lyrics on Rap Genius

Meaning

Ice Cube got into trouble with Jewish human rights groups for using the J-word on “No Vaseline” where he says,

it’s a case of divide-and-conquer
Cuz you let a jew break up my crew

and

Get rid of that devil real simple
put a bullet in his temple
cuz you can’t be the nigga 4 life crew
with a white jew tellin' you what to do

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