Comes from the word "vanilla", which is the same cracker ass shade as white people. Its the opposite on being "nigger rich". See example
"Yo, T Money has a mansion, I bet hes got a 50 inch plasma"
"Nah playa, he's got the 12 inch Samsung tho"
"Damn, he IS nilla rich"
racial slur for a white person who tries to look like they live above their means; a poser if you will.
look at that cadillac sittin on 12's, man thats nilla rich.
that fool lives in the project but he gotta 50 inch HD plasma tv, he livin nilla rich.