Yeah, I don’t know what else to say
I can’t, I can’t think of nothing, I’m stumped

from Royce Da 5'9" (Ft. Eminem) – Writer's Block Lyrics on Rap Genius

Meaning

He has Writers Block, he can’t think of anything to say.

Writer’s block is a condition when an author loses the ability to produce new work. The condition varies widely in intensity. It can be trivial, a temporary difficulty in dealing with the task at hand. At the other extreme, some “blocked” writers have been unable to work for years on end, and some have even abandoned their careers.

He references back to his days when he had writer’s block (along with drug problems, family problems, etc.)

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