I'm a man of my words so your fucking heads better nod

from Lil Wayne (Ft. Eminem) – Drop the World Lyrics on Rap Genius

Meaning

Double entendre.
Like Em said in the line before this he’s not going to hold back with his rhymes, and in this line he makes sure you understand that he’s back, and is again a force to be reckoned with.

He’s truthful, and his entire self-worth lies in his ability to manipulate his words and rap (man of my word).

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