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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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2
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 01, 2019
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3
Degrading, but fitting name to call a sexually active woman who isn't very intelligent and who has the compulsive habit/desire to give men oral sex.
Your mom: "Mmmmmh, mmmmmh, mmmmmmm."
Plumber: "Ooo yeah! Polish my tool, bitch!"
Your mom: "Mmmmmmm."
Plumber: "Okay you can stop now. I'm gonna "fix your sink" now. *gets out condom and lubricant*"
Your mom: "Mmmmmh yeah, mmmmmh, mmmmmmm, mmmmmh, mmmmmh, mmmmmmmmmmm!"
Plumber: "I said STOP now, Cum Brains!"
Your mom: "Mmm, mmmmmmm?"
Plumber: "You've got a bad case of oral fixation you know."





Mark H. Proud UD author since February 2004.
by Mark H July 25, 2005
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4
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 17, 2019
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5
When a man blows his load into a girls ear and she gets a massive migraine.
After 28 stright hours of oral, I think ill give her cum brains.
by asdfjkl'; June 05, 2005
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6
A feeling sorta like a brain freeze that happens right before you cum or while your cumming most common in males.
She made me cum so hard I got cum brain..
by The Bearded Beast August 12, 2018
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7
1. A person who always thinks about cum and/or has an obsession with cum. These type of people are very unpopular and will not attract men or women, even if they are LGBT.
2. A person from Cumberland or Cumbernauld that is very smart.
3. A misspelling of "Cumbrian"
4. Another spelling for cum brain.
1. Look at that Cumbrain! He's fucking retarded!
2. I'm friends with a Cumbrain. He's very smart.
3. My friend is Cumbrain. Oops sorry I meant Cumbrian.
4. That girl gets called a cum brain. I don't, I call her a Cumbrain. See a difference?
by FunkDaBeat October 03, 2014
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