This statement of Scout's takes place in Chapter 14 of To Kill a Mockingbird after Scout discovers Dill under the bed; he has run away from home because his mother pays no attention to him. After Jem "breaks the code" and reports to Atticus that Dill is there is the house, Atticus tells Dill that he must report his presence to his Aunt Rachel.
As Dill makes his "way through the leftovers," Aunt Rachel arrives and lets her
Do-oo Je-sus went off in the hall. He [Dill]shivered like a rabbit. He bore with fortitude her Wait Till I Get You Home, Your Folks Are Out of Their Minds Worryin', was quite calm during That's All the Harris in You Coming Out, smiled at her Reckon You Can Stay One Night, and returned the hug at long last bestowed upon him.
Dill obviously knows that Aunt Rachel is more bark than bite, although he shivers at first--perhaps in anticipation of the same tired phrases to come. His fortitude consists of bearing up through the litany of phrases that she goes through until she finally breaks weak and allows Dill to stay and hugs him.
Scout said this in reference to Dill. This was a reference to a typical statement Miss Rachel would say. I think it might have occured after the kids claimed they were playing strip poker but were really sneaking into the Radley's backyard... it is the only time I can think of that Scout, Dill and the adults would have all been talking together.
Scout is saying that Dill happily and confidently took Miss Rachel's reprimand and was not necessarily worried about the consequence she might have had for him at home. He was ready to take what Rachel would have had for him in terms of punishment no matter what it was.