I'm the coldest nigga rapping

from Domo Genesis (Ft. Tyler The Creator) – Rolling Papers Lyrics on Rap Genius

Meaning

“What’s cooler than being cool?"
"Ice cold!"
-Andre 3000, Hey Ya

below line might but probably is NOT reference to Outkast, as Outkast is still cool, but not as known during their Speakerboxxx/Stankonia/etc days.

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