Now once she go black, she ain't never coming back
I'm sorry Mr. H, I thought you already knew that
Kanye seems to be the “him” in the line “anyone but him.” Either way he is now explaining to Mr. Hudson why she wants Kanye, or the black guy, and not Mr. H
Once a girl dates/hooks up with a black guy, she won’t be going back to white guys.
Kanye is saying that this is common knowledge.
To help improve the meaning of these lyrics, visit "Anyone But Him" by Mr. Hudson (Ft. Kanye West) Lyrics and leave a comment on the lyrics box