what is the effect of the repetition of 'as they say' within the nurses lines?

Back in the Capulet orchard, Juliet eagerly awaits news from the Nurse. When the Nurse eventually arrives, she comically refuses to give Juliet any information about Romeo until she has received a back rub. Part of her comedy is to use "as they say" to talk about other matters than what Juliet wants to hear about.