It's either cause they boyfriend's a scrub like Brillo
Cause Banks is cooler than the other side of the pillow

from Lloyd Banks – I'm So Fly Lyrics on Rap Genius

Meaning

One of my favorite Bank$ punch lines.

Banks is using TWO double entendres to illustrate:
“Girl, i know u want this dick. Is it because ya man’s lame or is it kuz i’m awesome?”

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