Indignation Junkie is a term coined by David Brin in his novel "Existence". It refers to the gratification people feel when they are emotionally aroused by their own act of expressing outrage, frequently on a moral or
social injustice issue. This actually causes their brains to release endorphins/dopamine, which cause a form of euphoria and further arousal. They actually get high from their own
indignant rants.
"Mary spends every night arguing furiously with people on FaceBook. What cause is she so fired up about?"
"Does it matter? One thing
yesterday,
something else today. She really just likes arguing. She's such an
indignation junkie"