Yeah, I say
Bitch bad, woman good, lady better
Hey, hey
Hey, hey

from Lupe Fiasco – Bitch Bad Lyrics on Rap Genius

Meaning

Lupe is against the use of the word “bitch” as it is very demeaning to women. Therefore he says that by using the words “woman” or “lady” it is a much more respectful and correct way to address women
Lupe made much the same point on the the song “Hurt Me Soul” (which was on his first album Food & Liquor) in which he also mentions that he didn’t like the word “bitch”.

A hypothesis of his equation: bitch = subhuman; woman = simply human; lady = above human

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