What does Maggie say in the baptism episode and why?

Answer 1

She says "daddily-doodily" because the kids had been spending so much time around the Flanders family.

Answer 2

She says didadidily-doodadily and then creepily turns her head around to Bart and Lisa as though she is possessed but the reason she says it is because she has been spending so much time with the Flanders' that she has picked up words from them