Too be even more racist than you are.

Briefly, "the realization that each random passerby is living a life as vivid and complex as your own." Originally from the Dictionary of Obscure Sorrows, which has a lot more beautiful neologism definitions like this you might enjoy.

Someone who is your sister and acts racist.

"Mike seems like a cool guy, but his sister is a little odd."
"Why?"
"She has a burning hatred for minorites"
"Oh, you mean his racister.

When someone says something racist that is so bad it's on a whole new level

It means being extra racist