We don't have synonyms for flumdiddle yet — it may be a rare, specialized, newly coined, or misspelled word. The closest thesaurus entries we have are flumadiddle, flummadiddle and flummydiddle.
(n) :
Alternative form of flummadiddle. [(US) A baked main course pudding consisting of stale bread, pork fat, molasses, and spices including cinnamon and allspice. It was a part of early American cuisine, especially in New England.]
(n) :
Alternative form of flummadiddle. [(US) A baked main course pudding consisting of stale bread, pork fat, molasses, and spices including cinnamon and allspice. It was a part of early American cuisine, especially in New England.]