Observe the stillsuits within stillsuits within stillsuits.
Not knowing much of Dune, this led to me reading quite a lot of resources online.
The more you get into Dune the weirder it gets
I first thought it was a paradise parasite of some kind, but I ended up understanding it's a perfectible sensible conversation between a conscious pre-born and their mother, where the former jokes about using their mother as a suit that repurposes every drop of moisture into their body.