Today I came across the wonderful word dardledumdue. It means “daydreamer” in East Anglian dialect (east of England), and its origin is uncertain. Perhaps it’s the type of nonsense words a daydreamer might sing or mumble while daydreaming [source].

It also sounds like the kinds of ‘words’ some Irish singers use when lilting – a way of singing tunes with made-up words.

Here’s an example:

Another example:

Does anything like this exist elsewhere?