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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