Workin out, all I curl is my index finger

from Ghostface Killah (Ft. The Notorious B.I.G. & Raekwon) – Three Bricks Lyrics on Rap Genius

Meaning

When one works out, an effective exercise often used are bicep curls, done by holding a weight with your arm fully extended and bringing it up towards your shoulders. Ghost uses that workout but on a different part of his body; his index finger. He curls it in, pulling the trigger of his gun and most likely killing people.

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