As nouns the difference between didi and didie
is that didi is a respectful address for any familiar older women by a speaker while didie is a diaper.
didi
English
Noun
(
en noun)
A respectful address for any familiar older women by a speaker.
didie
English
Noun
(dies)
(informal) a diaper
References
* Warren, Robert Penn (1905) All The King's Men , HBJ Publishers, p. 191