Now I tell everybody Nas had killed him on "ether"

from Kendrick Lamar – Beyonce Lyrics on Rap Genius

Meaning

Jay-Z used to be kendrick’s favorite rapper, but since he got with Beyonce, Kendrick has been telling everyody that Nas won the famous battle betwwen Jay-Z and Nas.
http://www.youtube.com/watch?v=0ePQKD9iBfU

To help improve the meaning of these lyrics, visit “Beyonce” by Kendrick Lamar Lyrics and leave a comment on the lyrics box