For one thing I'm underneath 110 dumbbells

from Slaughterhouse – Funkmaster Flex Freestyle Lyrics on Rap Genius

Meaning

He means his fists and strong and deadly
Shady 2.0 must have quite the in house personal trainer/gym. 110 lbs in a single dumbbell is quite heavy and Mr. Ortiz is curling two with ease. That must be why he can knock heads off collarbones.

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