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The word to describe the combined body part created when one shoves their head up their ass.
He's got NO I.Q., he's a walking brainus.
Brainus by Phuqit November 12, 2006

brainsplain 

A mental health professional explaining to a patient the reason the patient does the things they do.
I went to the headshrink the other day and he tried to brainsplain to me why I yell so much. Who does he think he is? He don’t know me!
brainsplain by Bogrimm March 11, 2018

fucked her brains out 

When a man fucks a woman so good she orgasms multiple times, trembles/shakes uncontrollably, is unable to speak properly and needs to sleep afterwords to recover.
Ted: Fucked me girlfriend last night good and proper, she couldn't speak properly afterwords.

Bob: Thats because you fucked her brains out man.

Ted: Fucking right i did!

brains and brawn 

A term meant to describe the unusual and rare type of person capable of obtaining both considerable intellectual prowess and desirable physical attraction.
Mother of Woman: Well he sure seems like a keeper Betty, what does he do for a living?

Woman: He is head of the country's foremost research organization on time travel and accelerated particles in neurology. (Satisfied look on face)

Other Woman: Hubba hubba , Brains and Brawn. (Raised eyebrow)

Mother of Woman and Woman in synchrony: You keep your cookies to yourself for once Margaret!
brains and brawn by Richard Groot October 23, 2018

beat the brains out of the little soldier 

To jerk-off purely out of sheer sexual frustration or desperation.
"Man, that ho at the club was grinding on me for like two hours, then she left with my friggin' roommate! I gotta' go beat the brains out of the little soldier!!!"

shit-for-brains 

An idiot; one who seems to have shit instead of brains, thus severely limiting their thought capacity.
Hey shit-for-brains, you fucked up again didn't you?
shit-for-brains by progamer124 January 18, 2003