Who I gotta shoot just to prove that I can rap?

from Eminem (Ft. Mr. Porter & Royce Da 5'9") – Westwood Freestyle 2010 Lyrics on Rap Genius

Meaning

Some other rappers have taken the opposite road, getting shot just to prove that they can rap (i.e. 50 Cent)

Being as they are on Westwoods Radio Station as well, he is making a reference to another Radio station…
Saying, who I gotta shoot just to prove that I can rap…

http://en.wikipedia.org/wiki/WQHT#Fights_and_shootings

Radio stations Hot 97 is famous for having rap artists shooting in and around their radio station.
It’s happened multiple times, and he’s saying, who do I have to shoot to get the publics attention?

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