Plus, yo my bitch make your bitch look like Precious
from Kanye West (Ft. 2 Chainz, Big Sean & Pusha T) – Mercy Lyrics 3 on Rap Genius
Meaning
Ouch. Ye’s referring to the lead character from the 2009 movie Precious. Played by Gabourey Sidibe, Precious was obese, illiterate and not easy on the eyes by society’s standards.

Big L used a similar line back in ‘94 in his song “Put It On.”
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