A person who sees doom coming for humanity as a whole for either rational science-based reasons (AGW, nuclear war, doomsday clock, etc) or irrational reasons (zombie apocalypse, god's punishment, etc). Sometimes used as a slur against schizoid or loner types who have negative worldviews for mental health reasons.
This guy reading The Sixth Extinction is becoming more and more of a doomer as he turns the pages.
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