I don’t flow, I ceiling

from Lupe Fiasco – Say Something Lyrics on Rap Genius

Meaning

To be more specific, see when Lupe flows, he sometimes can go straight over your head if your not paying attention.

i.e. like it did to the explanation of “just a little wordplay"
Indeed, he doesn’t flow/floor, he ceilings because his lyrics don’t just flow, they are complex and hard to understand at first, thus "i don’t flow i ceiling” = he goes right over your head.

Pretty darn clever I tell ya

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