But he won't fight back. I cracked his jaw
Hold up! 'Bis, quit foldin' up!
Punch me in the chest, make my shoulders touch

from Eminem – Canibitch Lyrics on Rap Genius

Meaning

Canibus is such an inferior opponent that Em is begging him to fight back to make things interesting. Also refers to something Canibus said on Common’s Making a Name for Ourselves

MCs compete with lyrics and beats get crushed
I’ll hit you in your chest so hard your shoulders will touch

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