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A stupid person; it refers to the lack of surface area on an individual's brain. The general thought is that the more surface area (wrinkles, creases, etc.) a brain has, the smarter the person is. Conversely, a person with a smooth brain (no wrinkles) has less surface area and would therefore be stupid.
That fucking smooth brain put his shirt on backwards again...

That smooth brain is dumber than a pile of shit.
by Tip Tank May 14, 2011
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Jan 18 Word of the Day
1. Blue Monday is the most depressing day of the year, calculated by Dr. Cliff Arnall, a researcher at the University of Cardiff's Center for Lifelong Learning.
Factors used to calculate the date included weather conditions, debt level, time since Christmas, time since failing our New Year's resolutions, low motivation and feeling the need to take action.

In 2005 the date was calculated as January 24th, in 2006 it was January 23rd, and in 2007 it was January 22nd.

2. A song by the hard rock band Orgy from their album Candy Ass.
1. Guy: "Aw man, I feel like absolute shit today."
Friend: "Yeah, same here. I hate Blue Monday."

2. "I wish I could sing Blue Monday to my ex-girlfriend, she's such a bitch."
by L_Roku August 31, 2007
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2
A way of calling somebody very stupid that requires them to be smart, in order to understand.
Person 1: Dude, why did you think that was possible? You're such a smoothbrain.
Person 2: ...huh? What the hell is that supposed to mean
Laughtrack: *laughs*
by Glitchgoat September 05, 2019
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3
Opposite of big brain. Smooth brain refers to an idiot or someone dumb. Neuroscientists believe the more folds you have in your brain means the smarter you are. Therefore if you are called smooth brain, you have less folds and therefore dumb.
How did you forget to lock the door? Good move, smooth brain.

You don’t know basic math? Smooth brain πŸ™„
by TheoPham September 13, 2019
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4
A derogatory term used to describe someone after they have done something unintelligent, clumsy, or foolish. This term implies a below average intelligence due to an abnormally shaped brain. The expression is used almost exclusively for criticism.
Dude 1: Hey, did you hear that Mike literally got in an accident with a parked car yesterday!
Dude 2: Ya, I cant believe it. What an absolute smooth-brain.
by Mike N. Ike April 03, 2019
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5
Smoothing out your brain will also negatively affect your intelligence and reason, this is precisely why smooth-brainers are often called "stupid hippies" or "vegans" by lower class citizens because they seem to become increasingly stupid as they level up. This will however all pay off in the end, when you reach the ultimate goal of unity with the universe. The path to godlike status is and literally goes through the "rough", which is also why around half of the worlds population decide to stay in this lower level of "rough" class brainers, which usually leads to a steady decline of their life into a criminal and abuse filled life-path, which always tends to end in horrible death.
by Smoothbrainer69 October 22, 2020
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Very smart person. their brain is smooth the is no resistance to knowledge
Brian has a smooth brain. Josh does not
by Brain Pretzel September 17, 2020
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