The story
Possibly a rhyming reduplication of halloo (used as a greeting or to catch attention; used in hunting to urge on pursuers), hilloa, hullo (variants of “hello”), and similar words.
First known use, by meaning
- from 17th c. A clamour, a commotion; a fuss or uproar.
Etymology from Wiktionary, CC BY-SA 4.0.