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Someone from Generation Y, aka a Millennial, who is the equivalent of a Boomer.

Someone who participates in outrage culture.
“She’s such a Moomer! All she talks about is the ‘good’ old days when you had a top 10 friend list on MySpace!”

“That Moomer voted for Bernie in the presidential election, even tho he lost the primary!”
Moomer by Ajax Ryan December 28, 2020
Related Words
An individual who is of a similar age range to Baby Boomers but has the mannerisms of a Millennial. Commonly into sports such as baseball, usually enjoys drinking and chewing tobacco. Often has a negative opinion of Millennials despite having almost identical characteristics.
"Hey Dave did you see that stupid Millennial watching hockey? Baseball is a much better sport. Let's go on Snapchat and Instagram to tell our fellow Moomers how stupid Millennials are".
Moomer by Japlow October 14, 2019
"moomer" is a typo found in the Korean game gunbound. The "Boomer" tank was incorrectly labeled "moomer" for much of the beta release of the game.
I just pwned j00 with moomer!!
how to play lar?
moomer by chowdy August 31, 2006
A millenial, or beyond, working on a Boomer product or system.
A Moomer failed to follow procedures which resulted in a single corrupt file dropping 30 ywar old aviation software to its knees and preventing flights from occuring to the United States of America.
Moomer by buht January 12, 2023
the millennial equivalent to boomer and zoomer
shut up moomer
moomer by A1.exe April 19, 2023
A person who is addicted to memes, in other words a redditor. They can also be called meme and or edgelords. The word is a spin on the word "coomer" which is a person who is addicted to cooming.
John: Hey have you seen this meme?
Fred: Stop being such a moomer and get a fucking life.
moomer by spookiebruh January 28, 2021