Wantin' to jump dude, but let that nigga punk you
Knowin bitch niggas wanna bring guns to the rumbles,

from Chance The Rapper (Ft. Kembe X) – JUICE Lyrics on Rap Genius

Meaning

Chance knows being from Chicago that kids would usually react at parties by wanting to fight. Chance is letting them know to just let the situation go. “But let that nigga punk you” meaning let it slide. In Chicago, people are quick to shoot rather than fight.

See pretty much every Chief Keef song ever…, (from “I Don’t Like” in particular):

And we ain’t gon' fight, our guns gon' fight

In reference to the film Juice, 2Pac’s character later kills his friends and always carries a gun, even at “rumbles”.

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