It's a more formal and deep expression of love compared to the general greeting "Aloha".
Here's a breakdown:
* Aloha: This is the most famous Hawaiian word, meaning "love, affection, compassion, peace, hello, goodbye" and many more things depending on the context.
* Au: This translates to "I, me".
Therefore, putting the two together, "Aloha au" means "My love" or "I love you".