Niggas be on dirt
That's why I stay on petty

from Chance The Rapper (Ft. Ab-Soul) – Smoke Again Lyrics on Rap Genius

Meaning

“Petty” is common Chicago slang for being bogus with somebody. Since Chance is on the come up, a lot of people are willing to lie to him to be down with him and share the perks, but Chano don’t play that.

But check the wordplay going on with “dirt” and “petty” here. “Pedi” like a pedicure — getting your feet done. Niggas be on dirt means the people in his city get dirty, (sell drugs, rob, kill, illegal etc). Chance stays on pedi, he’s clean, not involved with all that gangstas.

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