That's why my pen needs a pad cause my rhymes on the ra-ag

from Eminem – Berzerk Lyrics on Rap Genius

Meaning

Since Em’s rhymes murder everyone, he needs a pad of paper to soak the blood up from his pen. Also a clear reference to menstruation, as “pad” is a common name for a sanitary napkin which women use when they are “on the rag” (having their period). Em has made reference to his rhymes being on the rag before.

The cadence of the last word is especially reminiscent of Adrock on “Licensed To Ill” (which is also produced by Rick Rubin)

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