noun; any animal having shit substituted for brains in the region of the skull: a direct result of having ones head up ones ass
That Jim is one of the dumbest mother fuckers I know. What a fucking "shit for brains".
by green giant March 9, 2003
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A stupid person, does not actualy refer to anyone actualy having shit in their skull.
"God damn it, you really do have shit for brains dont ya?!"
by MattTheJackass November 1, 2005
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A shit for brains is usually heavily retarded, or this is this a gross understatement? My 40 year old sister thinks that electric cookers run off gas and she doesn't have a clue how much anything is at Poundland. She isn't just thick, she has shit for brains. Fancy calling your kids Skip? Toad? Soil? and Dildo? Fucking stupid shit for brains bitch Notwithstanding, she has very recently learnt to write her own name. Need I say more? She's a shit for brains. She's an ass wipe. She's a lude crude rude bag of pre chewed food, dude. She has the only house that you are more likely to slip on a turd inside, than outside in the street. Shit for brains also live in shit and furthermore never clean the toilet.
A shit for brains live in a smashed up stone henge's of a house, complete with boarded windows and big black and white checks up the walls. Gone is the stone furniture, gone is the scabies. She is a shit for brains along with her brand new silver woodwork and a purple wall. Shit for brains totally fucking ruin houses, no shit. Shit for brains live off Pot noodle, Frozen pizza, done in microwaves, check that grease and get pissed every day on anything remotely alcoholic. Shit for brains go out with or marry guys called Andy, who are also well and truly SHIT FOR BRAINS!
by Freddy fingers 45 May 3, 2012
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One that is sooooo stupid that he/she is brainless. He/she must not have a brain, but shit in his/her skull, therefore, he/she must have shit for brains!
Ohh my God, you fucked that up again! Man, you must have Shit For Brains!
by Trevo October 13, 2006
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Someone whoose brains have been replaced by human excrement.
Me: Jesse, you have shit for brains!

Jesse: Oh man... speak with love...
by AMR supervisor April 15, 2010
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1. A stupid, careless person.

2. A person that has fecal matter in their cranium.

1. "Jack is a shit for brains idiot"

2. Intern: "Holy shit this man has a bad case of 'shit for brains'."

Doctor: "Jesus Intern your right, we must get this fecal matter out of his cranium."
by swompwhomp March 23, 2009
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Sgt. McCallum: Shit for Brains, what's your 10th general order?

Me: Sir, I..I mean this Recruit does not remember, Sir!

Sgt. McCallum: WHY YOU STUPID FUCKING INDIVIDUAL, GET ON YOUR FACE AND GIVE ME 25!

Me: Aye Sir!
by Uhhhh March 11, 2005
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