What is the meaning of "GALL"?

Normally I avoid these sites, fearful of what I might see written about me. Today, however, calls for an exception, and I find myself clicking through website after website. Nearly all of them have mentions of Lisa’s suicide. Like the article in the Times, there’s little to no new information. Most of them stress the irony of a world-famous survivor being responsible for her own death. One even has the gall to suggest other Final Girls could follow suit.