That’s why's no booth and I'm rhymin' in the Lou, still buying the CD
That’s why I catch 'em rhymin' in to me while they rhymin' in they room

from Lupe Fiasco – What It Do Lyrics on Rap Genius

Meaning

Lupe is saying he is not always in the studio. He in doing shows in St. Louis. But his fans still cop the CD and bang it in they rooms while rapping his lyrics with him.

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