I'll cut ya fuckin' balls off, homie, my saw's off the chain

from Eminem (Ft. Mr. Porter & Royce Da 5'9") – Westwood Freestyle 2010 Lyrics on Rap Genius

Meaning

“Off the chain” is slang for awesome. Shady’s chainsaw has spun so fast that it has literally flown off of the chain, probably decapitating whatever was in its path

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