Put the hottest rappers all on one stage together
See who'll hold they arm up like Che Guevera

from Joell Ortiz – Battle Cry Lyrics on Rap Genius

Meaning

He claims that if you were to pit him against all of the “industry’s” hottest rappers, he would come out on top. The image he provides is him having his arm raised, which is a common practice to identify the winner. He relates that to the image of Che Gueverra, because Che often was depicted as having one arm raised with his hand in a fist

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