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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
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."

brainrection

A condition that exists when all of the blood rushes to your brain. Typically brought on by shocking, interesting, or new information.
I had a full-on brainrection, when I heard the news about Thomas Coyne.
That movie was a Total brainrection.
After reading that book I couldn't get a brainrection for a month.

braintellectual 

A portmanteau of the words brain and intellectual that describes individuals whose intellectual capabilities are so great that they understand this word and probably more complex subject matter too.

The opposite of brainlet.

It is very commonly used in a sarcastic manner.
It can be used as an adjective or a noun.
Bradon, you got really high grades so that means you're a braintellectual
Justus, in all his braintellectual musical genius, exclaimed "the percussionist sets the tempo!"
While brainlet Chads are busy fucking whores, a braintellectual such as me will be busy doing your mom!
somebody who has a very small brain and can't make simple decisions
"Liam doesn't use his shield, what a brainlet[
brainlet by PoobMeister August 16, 2019