I get it custom, you a customer
from Kanye West (Ft. Jay-Z) – Otis Lyrics 2 on Rap Genius
Meaning
While Yeezy gets his clothing made by Savile Row’s most sought-after tailors, you are merely a customer — essentially you are a peasant in a potatosack
This is a slick line, in that Kanye is referencing Jay-Z referencing EPMD; Jay’s 1997 track “You’re Only a Customer” was a conscious nod to the EPMD classic.

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