However it happens, you definitely don’t want to be swimming in that cesspool!

But the Death Star blew up less than a day after Luke, Han, Leia, and Chewie encountered that one

Maybe the eggs are in Stormtroopers rations, then they hatch in the intestines and end up in the waste

^I don’t really know what to say to that

Read the ESB edition of From A Certain Point Of View. Full explanation therein. Same for Exogorths, Tauntauns and Wampas. The Exogorth story is absolutely brilliant.