All that's coming out the mouth of the nigga you used to know as being 50's dog
But I got tired of being 50's dog
Had to break my chain and cut that nigga 50 off

from Game (Ft. Meek Mill) – Scared Now Lyrics on Rap Genius

Meaning

Everything he’s saying is coming out of the mouth of the man who used to be on G-Unit. He was tired of being a member, since 50 was the leader and Game ain’t no follower. He had to break with G-Unit to become who he is now an achieving solo-artist.

There is also imagery in the breaking of the chain, because not only was Game 50’s dawg, but he felt like a dog when beneath him.

To help improve the meaning of these lyrics, visit “Scared Now” by Game (Ft. Meek Mill) Lyrics and leave a comment on the lyrics box