I'm the feeling of a millionaire spending a hundred grand
This must be more or less what it feels like when I spend $250. So, Nas is exhilarating in the moment, but leads to some regret later.
Nas means he is the feeling of being able to do something so hard so easily. The feeling of a millionaire spending a hundred grand, like the feeling of a great rapper spitting a great song. Easy for them to do, impossible for others. A great metaphor.
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