I'm the master that masturbated on your favorite emcee
Using alliteration here, Kendrick reiterates the fact that he specifically is the king of hip-hop who has killed (in this case, masturbated on) your favorite rapper. Looking back on his Control verse, it’s very obvious that he has (unless it´s Nas or Jigga).
“I’m the master…” connects to the first line — he has a masters degree in rap compared to other rappers who just graduated.
To help improve the meaning of these lyrics, visit "BET Cypher 2013" by TDE (Ft. Ab-Soul, Isaiah Rashad, Jay Rock, Kendrick Lamar & Schoolboy Q) Lyrics and leave a comment on the lyrics box