I should have known by the way that you stared
Eyeing passers-by like you're rich but life ain't fair

from Kelis (Ft. Pusha T) – Popular Thug Lyrics on Rap Genius

Meaning

She noticed before that he’s got a ton of money, but unlike someone who’s gained their money through legitimate means, he still harbors an angry, resentful view of the world. The drug game makes someone mean, always fearing attack or arrest. Her man is giving off a vibe that doesn’t correspond with his wealth, which should have tipped her off.

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