What does Scout mean when she uses a reference to Mr. Jingle in To Kill a Mockingbird?Harper Lee's To Kill a Mockingbird

In Chapter 18 of Harper Lee's To Kill a
Mockingbird, Mayella Ewell is called to the witness stand during the trial
for rape of Tom Robinson.  In comparing her to her father, Bob Ewell, Scout remarks that
Mayella is not brash like her father in her testimony; instead she is "stealthy...like a
steady-eyed cat with a twitchy tail."  And, as Atticus meticulously, but politely,
questions her, she feigns offense at having been asked to repeat her age.  Then, after
Atticus's next question, she becomes furious,

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"Won't answer a word you say long as you keep on
mockin' me....Long's you keep on makin' fun of
me."

As she continues her
objections, diverting the direction of Atticus's questioning and becomes evasive in her
next answers, Scout observes,

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Mayella sounded like a Mr. Jingle in a book I had
been reading.

Here Scout
alludes to a comical character in Pickwick Papers by Charles Dickens, the book she has
been reading. Mr. Alfred Jingle, a strolling actor, is a humorous trickster and
charlatan who employs a strange syntax (e.g. disjointed sentences) of the English
language and weaves rather strange tales.  His comic, but devious tricks affect greatly
the other characters, the Pickwickians.