look up any word, like blumpkin:
 
1.
The polite way of saying "you are a complete retard"
My son is mentally disabled, but I still love him. Translation. I wish I never met that guy at the club
by I'm not a kid July 09, 2014
 
2.
A state of excessive intoxication where the brain stops functioning normally. May also be referred to as being blacked out.
I'm going to drink so much tonight that I'm going to be mentally disabled.
by fourfoursevens April 29, 2009