Always had flow, just added a front door, roof, and walls

from Lupe Fiasco – Form Follows Function Lyrics on Rap Genius

Meaning

His rapping has always had flow (sounds like he’s saying floor) so he built up around that flow to add new levels to his rapping skills. Just like how you would build up walls, roofs, and doors over floors. Lupe needs some place to hold his bed, desk, dressers, and drawers!

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