Dill Harris's Aunt Rachel Haverford is the character who says, "Do-o-o Jee-sus."

Miss Rachel Haverford lives next door to the Finches; every summer Dill Harris comes to live with her because his parents do not want to spend time with him. In Chapter 6, Jem and Scout sit by Miss Rachel's fishpool with Dill on Dill's last night in Maycomb. But, when they arrive, Dill wants Jem to sneak up on the Radley porch and peek into a window. Jem does so, but as he tries to leave, he makes a step creak. Frightened, he tries to run but catches his pants on a wire fence and must remove them to escape.

When the neighbors hear a shotgun fired, they run outside to learn what has occurred; Mr. Nathan Radley is standing with a shotgun broken over his arm. The children come up because they realize that Atticus will wonder where they are. When Atticus asks Jem where his pants are, Dill volunteers, "We were playin' strip poker up yonder by the fishpool."

Miss Rachel is appalled that Dill would be playing cards: "Do-o-o Jee-sus, Dill Harris! Gamblin' by my fishpool? I'll strip-poker you, sir!"