several definitions apply to this awesome word!
A)to be a British handicap
B)if your name is Brittany and you're a retard.
example A) "Allo chaps I'm bloody Brittarded" said with a british accent and a handicapped fucktard lisp.
example B) "My name is Brittany, I am Brittarded. Do you like ice cream? I scream for ice cream, Ice cream .. and your mom!"