They ain't from us but they're claiming they're Columbus

from Lupe Fiasco – SLR 3 (Round of Applause) Lyrics on Rap Genius

Meaning

Other rappers are trying to act sophisticated and keep it real like Lupe’s been doing. This is like how Columbus claimed he “discovered” America, when there were already people living there. It’s pun on word us: these people lived on territory of United States, while Columbus wasn’t from US.

He also plays on the myth that Columbus discovered the world was round in the next line.

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