What does Aunt Alexandra call Walter Cunningham that angers scout?

On page 256 of chapter 23 (may vary a little depending on which version of the book you are reading), Aunt Alexandra boldy insults Walter Cunningham in attempt to prove her point as to why Scout cannot play with Walter. The selection reads as such:

She had said Indeed Not, but this time she would give her reasons: "But I want to play with Walter, Aunty, why can't I?"

She took off her glasses and stared at me. "I'll tell you why," she said. "Because--he--is--trash, that's why you can't play with him. I'll not have you around him, picking up his habits and learning Lord-knows-what. You're enough of a problem to your father as it is."

I don't know what I would have done, but Jem stopped me. He caught me by the shoulders, put his arm around me, and led me sobbing in fury to his bedroom. Atticus heard us and poked his head around the door. "'s all right, sir," Jem said gruffly, "'s not anything." Atticus went away.