I am like a nickel of weed rolled in a doobie - I'm a little twisted

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

Meaning

A nickel is $5.00 worth of weed (which isn’t all that much).

When you don’t have enough weed to fill the paper, you twist it (the central pun of the line — Royce is “twisted” aka nutso). Royce is also referred to as “Nickel.”

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