Lil homies in the front dont know how to act
Launching from the last line, here Snoop is referring to the front of a car, or rather, the front seat. If Snoop lets you sit shotgun in his ride, he expects that you’re going to act cool, as he is giving you a great privilege.
However, since the “homie” sitting there has just starting smoking weed (hence he is “lil” compared to long-time smokers like Snoop!), and is feeling the effects potently (causing him to bug out, complain of hunger, etc.), he is not acting how Snoop would like him to.
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