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
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
slang term for a hangover
"next mornin we all woke up with mad brainworms and couldn't move without pukin."
by hytmal July 28, 2004

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