At the end of Stranger Things' season 3, we saw that Dustin has a new nickname: Dusty-bun. Also, we saw that
he calls his girlfriend as Suzie-poo
As I'm not a native English speaker, I can't understand those nicknames as a fluffy thing. For me, "bun" means a part of the human body that produces "poo", where both things are related with the toilet.
As the nicknames are meant to be cute, what are the other possible translations for this context that are not given by Google Translator?