High dudgeon

What is the meaning of the English phrase high dungeon. Ex. She was in a high dungeon over the events of last evening. I came across it in the new Harry Potter book, "Harry Potter and the Half Blood Prince"

It's actually "high dudgeon", not dungeon. This is from the on-line version of the Merriam-Webster dictionary (www.m-w.com):

"Etymology: origin unknown

a fit or state of indignation -- often used in the phrase in high dudgeon"