As I mastermind, craft rhymes made of heroin
Head nod, lines on a higher echelon
With fly epilogue,

from Cormega (Ft. Action Bronson, Roc Marciano & Saigon) – M.A.R.S. Lyrics on Rap Genius

Meaning

I design my raps so that the reaction to hearing them is similar to what happens after doing heroin.

Heroin addicts often nod off when high. People also nod their head to good music.
He is saying his lines (rhymes) are of a higher caliber than most other rappers

http://www.youtube.com/watch?v=rtr7DSFTVhY

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