A doomer is someone who is a believer of doomerism, a philosophy and mindset that believes that global problems (ecological exhaustion), such as overpopulation, peak oil, climate change, and pollution will inevitably cause the collapse of civilization, significant losses in the human population, and potentially lead to human extinction.
The ideology is defined in opposition to optimistic outlooks on life. Doomers believe that government corruption, civilian apathy, and/or structural oppression are unfixable.
Doomers tend to express feelings of despair and hopelessness about their own lives. The subreddit r/doomer was created in 2009 as a place for doomers to express their feelings and thoughts. A post written by Redditor u/newdoomr on 18 January 2020 titled “notes from a doomer” lists the doomer frustrations to the public at-large, questioning how they “are not all walking around in a state of pure unquellable panic.” Expressed within the text of the post is a determination that doomers are “awake” to the knowledge that the world is a cruel, sick, and meaningless place, that humans are only capable of destroying the natural world, and that even if doomers could “ascend” past their anxieties, it would be pointless, as the world is faced with inevitable collapse. The moderators of r/doomer pinned the post, and as of 8 August 2020, it had received 207 upvotes.