It's the Khan bitch, why you need a better reason?

from Capital STEEZ – Capital STEEZ Lyrics on Rap Genius

Meaning

The khan is title given to rulers and officials in central Asia, Afghanistan, and certain other Muslim countries. The most notable example of the Khan were the Khagan

The early Khagans were:
Genghis Khan (1206-1277)
Ogedei Khan (1229-1241)
Guyuk Khan (1246-1248)
Mongke Khan (1251-1259)

Here STEEZ is saying that he is the king so he wonders why this girl is rejecting his advances.

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