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Foomer comes from Boomer and Fan. It describes a person who is fan of a certain franchise and who complains about new entries in that same franchise.
A: "The Rings of Power" is shit.

B: Oh come on, you are such a foomer!
Foomer by Knomes2 October 27, 2022
Related Words
Foomer ok foomer foamer fooker footer Foofer foolery fooner froomer foober
Foomer are born from (1930s) to the (1940s). there isnt many i would assume since the 1930s to now its pretty long. but basically its a person who is even worse then a boomer. who thinks that zoomers and gen x people are retards.
saying such things as "SHUT UP ZOOMER" and "TRUMP IS BETTER THEN OBAMA" and more retarded things.
"SHUT UP FOOMER"
Foomer by Nicks Definitions November 21, 2019
Someone who think their lives in Fortnite
Morgan: I think Im gonna pop i mini incase someone shot me

Me: WTF ARE YOU TALKIN ABOUT FUCKING"FOOMER"
foomer by JUSTWANTTOFEELOK March 27, 2020
Combrination of "femcel" and "doomer".

Femcel is the female equivalent of an incel.

A doomer is someone who already gave up on life, listens to sad music and constantly tired.

A foomer is a femcel girl that has accepted her faith but is not happy with it. She wears black, has a pimpled face, bad odour, and a hopeless future.
Don't be such a foomer! You can still be a nice catlady or something.
foomer by urban pista 2 June 12, 2022

ok foomer 

Much like the phrase "ok boomer" but applies to furries who are being stupid and/or boomers who are furries.
Mackenzie: *says something rational*
Craig: *says some stupid bullshit*
Mackenzie: ok foomer
Craig: *uwus angrily*
ok foomer by yeetskeetbeatmymeat33 December 4, 2019