roger
Roger pretends to be the pig in the pig dance in "Lord of the Flies." He acts out the role during the boys' reenactment of the hunt, revealing the dark and violent nature that lurks within him.
The hunters chant "Kill the pig. Cut her throat. Spill her blood"
The chant is basically a description of the climax of a hunt. The boys drive the pig into a circle of hunters who 'bash' it into submission with the butts of their spears before Jack cuts its throat and spills its blood to kill it.
The monks began to chant during their meditation.Protesters normally chant the same thing over and over.
"kill the pig. Cut her throat. Spill her blood"
"Kill the pig! Cut his throat! Spill his blood!"
In chapter 9 of "Lord of the Flies," the boys chant "Kill the beast! Cut his throat! Spill his blood!" as they participate in a frenzied and violent ritual while hunting for the imagined beast. The chant reflects the boys' descent into savagery and their growing detachment from civilization and reason.
The monks originally sang Mozarabic chant, then the Gregorian chant.
Gregorian chant
Jack and his hunters chant "Kill the beast! Cut his throat! Spill his blood!" as they become increasingly savage and bloodthirsty in their hunt for a wild pig on the island. This chant reflects their descent into savagery and their growing obsession with violence.
It was popularized during the reign of Gregory IV
There isn't really a meaning behind it It was just significant because it was sung every time they were killing a pig. Perhaps it symbolizes or foreshadows their gradual change to savages.