In the drug culture Travi$ is referring, to one cannot cross certain lines (actual or metaphorical) or else it could spell death. This line also expounds upon the introverted persona and dark mood that Travi$ has built on the “Phoenix” mixtape.
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Rappers referring to themselves as Gods is directly attributable to the influence of the Nation of Gods and Earths, an NOI offshoot that has had an outsized influence on hip-hop. See here for a summary
The NGE believes that each black man is literally his own God, and address each other as such (women are “Earths”). This practice became very common as influential rappers such as Rakim, Big Daddy Kane, and others talked publicly about the tenants of the Nation
Coincident that he rocked a Nation of Gods and Earths chain in his latest interview? Probably not.