An condition where your thoughts are jumbled and your brain is just generally not functioning well. This is metaphor comparing the unorganized thoughts to food items floating about a soup without any direction. This is often caused by overworking yourself, having a hangover, or something similar. It's comparable to being brain dead.
Guy 1: How are you feeling this morning man? You were pretty messed up last night.

Guy 2: I have brain soup right now, I can hardly even think of a way to respond. Don't let me drink that much again for at least two weeks.
by Mr.BDC March 29, 2011
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A human being, more technically a high level competitive athlete or military veteran, that has suffered multiple brain injuries from repeated blows to the head, affected with or exhibiting TES (traumatic encephalopathy syndrome; diagnosis in a living person) Vs CTE (chronic traumatic encephalopathy; postmortem diagnosis.) Quite literally the action of one’s brain dying prematurely as a result of his taking so many blows to the head.
Johnny has brain soup, he has come to this restaurant five days a week for the past decade, yet he asks me where the restroom is every single time he comes here.
by Cugino_di_Carmine December 3, 2021
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n. The aftermath of a classic headshot. Often used in games and movies to indicate a killshot. Depending on the rating and nature of the media it ranges from simple blood spray to a graphical display of parts of the brain and/or skull.

Can also be spelled without a space, as brainsoup.
Playing Bulletstorm is insane! I can hardly see anything due to all the brain soup.
by Wyrlor March 18, 2011
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A stupid person, an idiot, someone who has no idea what is going on at any given time.
Person 1: She got lost on the trip, so clueless!
Person 2: she's a major idiot soup brain.
by Booklove2000 May 25, 2016
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