Definitions for "Holloa"
Pronounced "holler", a loud high pitched screaming shout, often seen with a cap-holding arm, to point out the direction of the fox.
(holler) View holloa. A loud, high-pitched yell by staff alerting Huntsman that the hunted fox has been viewed.
a very loud utterance (like the sound of an animal); "his bellow filled the hallway"
Same as Hollo.