Predetermined destiny is who I am
Predetermined destiny means that your path in life is unalterable. Your future is fixed by the fates… Interesting, as Beastie Boys seem to believe in Karma, which is antithetical to predeterminism, since you are able to make choices in life.
Here, it means he was born to emcee.
To help improve the meaning of these lyrics, visit "Looking Down the Barrel of a Gun" by Beastie Boys Lyrics and leave a comment on the lyrics box