An insult referring to the absence of wrinkles present in the human telencephalon(cerebrum) -- the largest region of the mammalian brain. Literally implying idiocy at a physiological level.
by drastic_quench May 23, 2008
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.
That smooth brain is dumber than a pile of shit.
by Tip Tank May 15, 2011
J: O, you have a smooth brain
O: Does this mean I have a cute brain?
*L, M, N, O, and P all start laughing*
O: Does this mean I have a cute brain?
*L, M, N, O, and P all start laughing*
by Ace the simp May 6, 2023
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 🙄
You don’t know basic math? Smooth brain 🙄
by TheoPham September 14, 2019
adj. word to describe people that are slow or stupid
adj. describes unfunny, uncool people that are lame
adj. describes unfunny, uncool people that are lame
by dirtydikdan October 20, 2021
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.
Dude 2: Ya, I cant believe it. What an absolute smooth-brain.
by Mike N. Ike April 4, 2019
Your brain doesn't work right and the gears don't function right. Otherwise said as you are stupid, dumb, an idiot.
by Smooth brained mf October 4, 2019