Similar to a "boomer" or a "zoomer," a "moomer" describes someone who is a Millenial, born between the years 1981 to 1996.

Intelligence agency term for "psychological operation". A government or corporate-sponsored operation, usually taking the form of a "terrorist attack" or "crazed gunman on a spree", with the intent of panicking the public into demanding more police and laws inhibiting freedom. Psyops are usually carried out by drugging a civilian or group of civilians with aggression-promoting drugs, psyching them up, arming them, and sending them out to commit mayhem. Government-sponsored terrorism. See also blackshirts, conspiracy

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.

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.

"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.

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

Someone who participates in outrage culture.