When someone that values morals gets very angry and/or retaliates after witnessing something they perceive as an act of evil.
"FEEL MY RIGHTEOUS FURY!"
~Butters, South Park: The Stick of Truth
"I only make these kinds of things when my righteous fury kicks in."
"When I do these things, it's because of righteous fury, not regular anger."
Acronym: God-Awful Cornholed Kook
Usually referring to a person who participates in anti-social behavior. Can refer to, but is not limited to:
-Internet Trolls
-Anti-Furries
-Bloxheads (Toxic Roblox Players)
-Stans (Especially the ones obsessed with authoritarian/fascist/terroristic ideologies)
-Etc.
"That user there? I heard he's an anti-furry."
"Great, another screwball gack on the loose."