Someone who expects the worst possible outcome from a global occurrence, especially the peak in global oil production.

Antonyms are cornucopian, humanist, realist.

Doomers hold a faith based belief that humanity is incapable of resolving human-society created global issues, e.g. by replacing oil with other energy sources.

Refer apocophilia
peakoil.com is packed full of doomers practicing group-think like it was a survival skill.

I used to be a doomer, but then I remembered how to add.
by Jaymax September 16, 2005
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In the gaming world, this individual constantly states that games nowadays are not as difficult, good, challenging, or as exciting as games were when they were a kid. They downplay modern video games and brag about the "good old days" of their youth.

DOOMer is a play on the word Boomer with a DOOM (popular video game for retrogamers) emphasis.
EX1:
Man, I'm really over watching XPLoot play CoD on stream, he's such a DOOMer.

EX:2
DOOMer: Video games used to be more difficult when I was a kid!!
Anyone Else: Okay, DOOMer!!
by TheRealDax November 20, 2019
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Someone who that revels in the thought of destruction of the planet or humanity due to global warming.

Antonym: denier.

Doomers hold an unshakable faith that the planet is inevitably doomed because of anthropogenic global warming and that nothing can reverse earth's ultimate destruction. In particular, doomers seem to take joy in discussing and contemplating a global doomsday.
The doomer took great joy in debunking a report that suggested that global warming doomsday predictions were exaggerated.
by Sierra Sam February 9, 2012
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n.

Used by the peak oil community to refer to those who believe that the end of the oil age will also mean the end of human society.
I'm a doomer 'cos wind and nuclear will never cut it, and hydrogen's a pipe dream.

You're doomerosity is only so high 'cos you're suffer from apocophilia.
by Jaymax September 27, 2005
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Sir Apocyl Doomer is one of the most intelligent men on Earth. He is so intelligent that most people are simply not wise enough to understand what he is saying. He personally attributes this knowledge to the amount of beer he drinks. He also is known for concurring instead of agreeing, a sign of intelligence. Apocyl Doomer is the preeminent scholar of Westsideology.
Apocyl Doomer said: I concur!
by IDoEnjoyCoffinDance April 13, 2021
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A Doomer-Zoomer is a younger Doomer, being born around the early and late 2000s. Most likely, Doomer-Zoomers suffer if not identical, similar issues of a Doomer.
Jacob was a nice kid in school and loved to learn, after he got a computer and his girlfriend dumped him, he became a Doomer-Zoomer
by Rcfoolz May 26, 2019
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Coronavirus (COVID-19)

It's gonna kill all the boomers
Hey bro *shakes hand* I just gave you boomer doomer
by alla gomma March 10, 2020
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