"noun. - Extreme chaos resulting in a community that was once peaceful. Most commonly recognizable by fans of the underground folk/metal band Sleepytime Gorilla Museum."
from urban dictionary... the only site that offers a definition.
"Awesome song. I'm trying to research the meaning of Ambugaton and can't come up with anything but reference to this song, can anyone help me out?" -- "All the way from the gates of Eden to the battle of Ambugaton, there'll be trials and tribulations, there'll be sorrow and despair. There'll be brother against brother, there'll be gnashing of the teeth. Those who seek it will receive it, mercy at the savior's feet."