Brainworm 

An belief (or set of beliefs) that become popular "en masse" and cause people to act erratically.

"Everyone in attendance at the ______ rally have the brainworm."

Brainworm by lazy_prophet February 19, 2021

brainworm 

An image, sound, or other thought (usually one that you don't want to think about) that gets stuck in your mind. The best way to get rid of a brainworm is to replace it with something else (just don't think about your current stuck thought, though).

A brainworm is different from an earworm in that an earworm is a song that gets stuck in your head, while a brainworm is anything that gets stuck in your head.

I have a brainworm. I can't stop thinking about the disturbing meme I saw last night.

brainworm by allam2342 May 3, 2018

Brainworm 

Getting a song (usually one you dislike) stuck inside your mind that repeats endlessly.

I've had a brainworm all day since I heard ... on the radio this morning.

Brainworm by DoubleDown September 9, 2008

brainstorm

verb:
to suggest a lot of ideas for (a future activity) very quickly before considering some of them more carefully.

They brainstormed and mapped plans for dealing with problems like affordable housing and the budget shortfall.

brainstorm by Frida Döerr August 21, 2008

Brainwrong 

Someone that is not quite right mentally and will continue with actions far beyond the point where normal people would have stopped .

"You are a one-man Brainwrong"
"That man is just Brainwrong"

Brainwrong by xXBADGERXx October 24, 2005

Brainworms 

Unproductive, unreasonable, and/or outright harmful ideas that become “stuck” in one’s head and/or internalized. A “brainwormed individual” is someone who has been driven insane by the outlandish and malicious content commonly found in spaces like 4tran and 4chan at large.

TFW the wriggliest of brainworms

Brainworms by Trashli November 2, 2022

brainwrench 

An unexpected juxtaposition of words or images usually but not always containing a sexual innuendo that is not obviously apparent.

"Hey Jessie, pass me that chocolate fudge filled donut"

Jessie says, "That's not a fudge filled donut", as he hands you the donut, filling hole first.

brainwrench by John Hutchinson March 5, 2005