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A brainhole is a portal into ones subconcious. It's like a personal galaxy inside your mind, but specific to you. Like a finger print... Its a realm of existance that only exists in your mind.
I couldn't wake up from that crazy dream last night. I was trapped in my brainhole...

Stuck in solitary confinement, I can still be free inside my brainhole...

Related words: Memory Palace, Mind Vault, matrix...
Brainhole by Sammyy February 11, 2017
immature,underdeveloped cerebral cortex,unfit for real world survival
Jimmy scored ninety on the I.Q.test. What a brainlet!
brainlet by TinFoilHatGuy May 11, 2017
A more polite and less offensive word meaning asshole or butthole. The word originated from the general misuse of farm animals.
"My barnhole is mighty sore."
"That lady must have one tight barnhole."
"My mommy and daddy are barnholes."
barnhole by babysue October 5, 2005

Brownhole 

The result of a person (or organisation) disappearing so far up their own backside that they warp a hole in spacetime from which not even logic can escape.
I came perilously close to the event horizon of a brownhole today and frankly, I'm lucky not to be buried in a whole heap of super-dense shit.
Brownhole by VliegendeSchot October 27, 2015
Someone associated with having a low iq and a below average common sense.
Tilly you brainlet!
Brainlet by Kaprie May 30, 2018
Individuals that search their names on Urban Dictionary and share the definition with others in order to feel good about them seleves. These people generally have IQs equivalent to that of small fish and think that Lelepons is funny.
"Hey, check out that brainlet over there."