B-b-b-bitch I ball; underwear
from Nicki Minaj – Roman In Moscow Lyrics on Rap Genius
Meaning
What does underwear hold? Balls of course.

Nicki loves this type of reference. Past lines include:
“I big ball, daddy, no Elephantaisis.”
“You at the bottom of the pole — totem/Like Lamar Odom, I ball — scrotum!”
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