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A phrase to describe someone who is cognitively degenerating. Synonym of "going off the deep end". Can have varying degrees of severity.

Reference to the song "Hey You" by Pink Floyd. The line "and the worms ate into his brain" makes no sense in an otherwise linear and literal narration throughout the lyrics.
"My boyfriend has a total case of brain worms. He told me the cat was bugged so the Feds could listen in on us having sex..."

or

"You totally stumbled over that entire sentence. Can't speak English all of a sudden? What, do you have brain worms?"
by _Jez_ October 03, 2009
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2
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.
by DoubleDown August 07, 2006
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3
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.
via giphy
by allam2342 May 03, 2018
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4
When an individual is so scared and insecure about committing to another human they use phrases such as “i’m just not ready for a relationship” or “ i can’t be with anyone at the moment, i just need my penis wet”. This phenomenon often becomes common in men between the ages of 18-23; using the excuse that they’re enlightened by the idea that they are in their sexual prime, but are just being a fucking pussy.
*picture of a couple playing minecraft and smoking a doobie appears on screen*
“hey girl, this could be us but i got brain-worm
by frawgment December 25, 2019
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5
"next mornin we all woke up with mad brainworms and couldn't move without pukin."
by hytmal July 28, 2004
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