It'll be like I'm starring in Saw when I start off shit
I'll be armed with the sawed-off to replace your sawed-off arm
With the same saw that it was sawed off with

from Los – Monster Remix Lyrics on Rap Genius

Meaning

plays around using the word saw saying he’s coming with a SAWed-off shotgun to replace your arm with the SAW it got SAWed off with

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