Baby, that navel piercing just ain't gon' work
If your fuckin' stomach lookin' like some balled-up homework

from Tony Touch (Ft. Crooked I, Joell Ortiz & Royce Da 5'9") – Slaughter Session Lyrics on Rap Genius

Meaning

The navel (or bellybutton) is a common location for a body piercing. It is most commonly found upon attractive ladies with flat stomachs, as opposed to women whose stomachs look like they’ve been eating their balled up homework for decades.

Someone like this is correct in not having their navel pierced.

Notice the resemblance?

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