She said "aye Kan, who you tryin' to be, Akon?"

from Kanye West (Ft. Alicia Keys) – No One (Remix) Lyrics on Rap Genius

Meaning

Akon is known more for R&B than rapping, while Ye is known more for rapping than R&B. Since he sings the previous line, his girl is asking him if he’s thinking about a career change. Not that we didn’t enjoy 808s & Heartbreaks, Kan, but please don’t quit your day job, (especially after your big brother and C.E.O. officially declared the Death of Autotune)

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