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A slang term used in the drug world meaning the sober person that looks out for the other person who's under the effects of LSD, mushrooms or other hallucinogenic drugs.
You bet I'm gonna try some acid, wanna be my ground control?
by Héctor Andrés Mayoral May 04, 2008
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Nov 27 Word of the Day
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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