* It's a made-up sound: Many sounds are created for creative or playful purposes, especially in children's rhymes or songs.
* It's a specific sound in a particular context: There might be a specific situation or cultural context where "dang-dang-ay" has a unique meaning.
* It's a misspelling or a variation of another word: If you provide more context or the full phrase where you encountered this word, I might be able to help you figure out what it means.
Please provide more information so I can assist you better!