Such a perfect insult to throw at your opponent.
To where you can literally hear the cum swishing around in someones brain.
Sorry man, I don't fucking speak the tongue of cumbrain.

OMG! I bet she so practices cumbrainism! What a SLUT!
by Lmaonade.mmm.yummy February 25, 2020
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A person obsessed with sex to the point where it becomes a detriment to their abilities to socialize and think through problems.
Mike keeps flirting with every girl he meets like a fucking cumbrain.
by Balanced Breakfast January 15, 2019
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Someone who thinks almost exclusively with their dick (or vagina) and goes on and on about porn and anime tiddies to the point of being annoying. Might also be an incel. Should probably have sex and stop watching so much porn so they can stop obsessing over it. Will likely argue that being interested in sex is natural or some bullshit, ignoring the fact that fapping 5 times a day isn't normal at all.
Person 1: What's your favorite Metroid game?
Person 2: For me, it's Samus. I WANNA FUCK SAMUS I WANNA FUCK THAT GAP IN HER THIGH WHEN SHE HAS HER SUIT ON AGGGHHHHH I WANT HER TO SUFFOCATE ME WITH HER TITS MOMMY MOMMY I WANT MILKIES RAGHGAHGAHGA I WANT A GF I WANT A GF GAHRUAWIGHAUHD
Person 3: Settle down, cumbrain
by ebinvirgin August 2, 2019
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someone who is overly addicted to pornography and/or masturbation. the name has been originated and gained some popularity from 4chan.
person #1: “have you seen person #3? i didn’t find him at school today.”

person #2: “he’s probably at home watching porn as usual.”

person #1 “why does he never do anything but watch porn? he’s such a cumbrain..”
by zaitra January 6, 2021
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An adjective used for someone who is constantly horny. To be used as insult to male who thinks about sexually activity 24/7.
"Yeah I kept asking her for nudes but she didn't send any."
"Stop begging for nudes and actually get a life you cumbrain."
by schoeymmii July 18, 2019
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The average redditor, obsessed with hentai, porn and jacking off.
Ewwwww, Brian is such a cumbrain
by Doctor ball-tickler February 8, 2022
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A person obsessed with sex to the point where it becomes a detriment to their abilities to socialize and think through problems. They typically act perverted and a threat to women.
Mike keeps flirting with every girl he meets like a fucking cumbrain. Call the cops
by ♥🗺☠ October 1, 2021
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