Shit, I’m another lit cannon ball
Fuck around and I’m going off and I’m getting throwed off

from Yelawolf (Ft. Kid Rock) – Let's Roll Lyrics on Rap Genius

Meaning

Cannons were old fashioned weapons that fired cannonballs. It is basically a big musket. You light the gunpowder and the projectile (the cannonball) gets fired

Yela is getting to blow up, and if you fuck with him, he’ll get heated and go after you (launch the cannonball)

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