A Lexicon of Wagnerian Gibberish
or
Non-lexical vocables in music

eg:
Heia
Interjection
1. aha! come now! come on! (expressing delight, playful remonstrance, encouragement)
2. you don't say?

Heu
Interjection
    oh! alas! ah!, ay! (expressing dismay, grief, pain, indignation)

Wagnerian:
Opzanger Brünnhilde's heiarop ––
Hojotoho! Hojotoho!
Heiaha! Heiaha! Hojotoho! Heiaha!

See also: Columbanus & Heia Viri (above.)

PS: The Latin word for “work” is: opera.