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Almost crazy. Bordering on "mental," which is completely insane.

One who acts like a retard, even though he does not have a condition of mental retardation.
Dude, I can't stand living with Jake anymore. He sits in the living room doing hot rails and playing World of Warcraft all day. I mean... the guy is driving me half mental!

That new kid is half mental. He smells like burnt onions, he can't dress himself and he always has mustard stains on his shirt.
by sc0ner June 18, 2010
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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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