What is the gibberish word for hello?

There's no single "gibberish word" for hello. Gibberish is nonsensical speech, so it's not a real word with a consistent meaning.

However, you could make up your own "gibberish hello" by combining random sounds or syllables. For example:

* Gleeple!

* Blargh!

* Zoop!

* Wibble-wobble!

Ultimately, the fun of gibberish is its lack of meaning, so feel free to invent your own!