n. Triumphant satisfaction that a person's behaviour is as bad as expected, combined with outrage at that behaviour.
2017
An unfortunate consequence of the mainstream media’s outrage (or ‘gloatrage’) is that political bias has begun to leak from the opinion pages into the news coverage, giving detractors further reason to eschew what have been traditionally high-quality news outlets such as the Washington Post and the New York Times.
2017
It’s time to stop being outraged. It isn’t even really outrage—it’s gloatrage, when you’re secretly thrilled that he’s proving himself to be just as bad as you thought.
2015
This has been an ugly news week, and the right wing gloatrage over the carnage in San Bernardino will likely dominate the news for days to come.
2011 (earliest)
Today Apple fanboys struggle to balance "Blackberry sucks" comments with "This…iOS5 update is taking forever" #gloatrage